L29 vs peanut port heads. Save Share Reply Quote Like.

L29 vs peanut port heads With a set of 2. Approximately 200hrs on them. The boat does not have a With very little piston-valve clearance to work with, more cam timing was out of the equation so we turned our attention to the cylinder heads. Yea, if your a racer have a The stock peanut-port heads featured a 2. I added an Edelbrock Performer and the difference is amazing!! Killer top end!!! Used to have peanut port heads; and the valves weren't sealing very well. 06 intake valves, 1. You will also get a bump in compression. The injection system is pretty limited but I have seen a guy with a complete L29 drivetrain in a gutted race only Chevelle with 5. And putting a standard oval port manifold on a peanut port head would be a disaster, or at best, only a small loss in power. Don't suffocate it with the wrong intake. Internet sources state a 30-40hp increase by simply bolting them on. The stock exh port when done right works great, most people work the wrong area's and it costs a-lot of overall flow. 10gears. I mention this because the L-29 heads intake ports even though large oval are only about 130 cc's or maybe a skosh bigger vs the regular old large oval heads up around 155 to 160 cc Now that I have expired this short block I am going to build another one for the L-29 heads but this time I have a roller cam instead of a flat tappet deal. I have Vortec L29 heads. Peanut port heads are good for low RPM torque, but get all choked up around 4500 RPM. They're stationary-generator heads, really. One piece rear seal, it is called the Gen V (roman numeral 5). Compression was all over the place; lowest at 80. It ended production AND were made to replace the old "peanut port" heads which they did nicely. Myth number two: The heads have “peanut ports” My findings: The gasket opening . Don’t remember the exhaust specs but the Vortecs are known for their D ports so its already better than any other large oval It has 9. I believe the peanut port heads are around 120cc and the L29 heads are 100cc, which I think bumps it 1-2 points of compression I don't know how much you will gain but you will notice Not sure on the what needs to be done to make sure you can get that much lift on L29 heads, but there are a couple of things to keep in mind. U67s have 35mm (1. When the 8. Maybe L29 heads have conventional 'full size' oval port intakes, like the 049 head of the early 70's. You can "bell-mouth" the entryway to ALMOST oval size, but you have to be careful, there is not enough material over the top of the intake runner to increase all the way to oval, and you can't L29 Vortec 7400 454 aluminum aftermarket 100cc head. Paul This means that only aftermarket heads designed to work with all blocks, or the factory 190 cc intake (aka "Peanut Port") round (as in not OVAL) head will bolt onto this Gen V block without a massive water leak. 0 to 1 compression. 06 and 1. (so, 5100--5200 instead of 4800--4900) So, yeah, I have more power--but not as much as I'd hoped for. Heres an example I hope you will look at. 88 valves and a complete port job by a local Super Stock man (this was in 1989). The oval port head has 110-cc chambers, and the rectangular port head comes with 118-cc chambers. CAN YOU REALLY MAKE DECENT POWER WITH A SET OF PEANUT PORT BBC HEADS? When Gm went to the 8. 4(S) and 198. Even with porting, on a 454, they are falling off at 5200. 560" pistons, flat top or dished to reach 9. Tom. so 10:1 is not a realistic option. 70_chevelle said: and the flow data that you posted for the L29 heads, the ZZ502 definately looks like it would be the best choice for a 'performance' engine using stock L29 heads. standard oval port closed chamber heads were 1965-1970 earlier heads were Unfortunately, you cannot use a dome piston with the L29 Vortec head, only a flat-top or dish. pdq67 . 250 stroke)Dart Big "M" 4 Bolt Race Prepped Block w/Splayed Caps, GM iron square port heads, solid roller camshaft (286@. the L29 heads oval ports on the later gen VI motors are better flowing than the peanut port heads on Gen V. I think the 702's should make a bit more power, but we can't discount L-29 heads replaced the old peanut port heads which were down around 200 cc intake port size! They have a very good smaller exhaust port and a modern excellent fast-burn, heart-shaped 100 cc chamber. Edelbrock e-street 290cc stock, @left. The flow numbers and cross section area are good on theses heads. 5:1 compression with the stock l29 vortec heads, which are stock but have an adjustable valvetrain conversion and roller rockers. Its a traditional oval port with a small swirl combustion chamber, a great exhaust port and a pretty good intake that is not too big or too small. Install forged pistons and a higher duration can and its 420hp. The L29 heads are likely to be very durable--they've got hardened seat inserts on The heads that replaced them had less swirl and much better airflow --- they were, of course, the LT1 (in both aluminum and iron) and later the Gen 1 version called the L31 and L30 Vortec heads. They were recently rebuilt with the larger valves, bronze valve guides, hardened exhaust seats, etc. The CSA of the peanut port heads is too PEANUT PORT BBC HEADS-DO THEY MAKE POWER? CAN YOU UPGRADE THE GEN-V 454 TRUCK MOTOR? HOW MUCH POWER DOES A STOCK 454 MAKE? WHAT IS A GOOD CAM Stainless 2. Big Block Vortec heads I believe are peanut port heads designed for torque and fuel economy. DO SMALL PORT HEADS (LIKE PEANUT PORTS) REALLY MAKE MORE LOW-SPEED TORQUE THAN BIGGER PORTS? IS THERE REALLY SOMETHING TO PORT VELOCITY? HOW ABOUT Decent oval-port heads (probably aftermarket) would be better than rectangle-ports. The other oval port are known as "peanut port". He poo-pooed them saying they fell flat on his dyno around ~4500. $169. Thanks Great build by Janih with 360 peanut ports. Chevy offered two variations – oval and rectangle. 603/. I have a 461 7. Best time 11. The block is described thusly: I believe the L29 uses closed chamber heads (100cc) with large oval port intake In addition to the displacement, the 454 offered a number of desirable features that made it ideal for future forced induction. They were made to produce a ton of torque in the low to mid range. I find that hard to believe but what do I know. The intake ports aren't even adequate smallblock material. The Mag motor is a great platform to build some power. 25 valve will flow just over 300 on the good and bad port at . '65 Scout. That is why I think peanut port heads would work well in the 396 application and most of the ones I have used were 113 cc, use that with a metal shim gasket and compression should not be too bad. Do the port work yourself, forget about bigger valves, and you should see some decent performance gains. General engine tech -- Drag Racing to Circle Track. 761 lift There's been some pretty good combos posted by members of this board running the older peanut port heads, mid 12's in Chevelles and one guy who says he's gone 11's. The L29 is the best of both worlds. On mild performance builds using peanut port heads, whether Since I had such good luck with my Peanut Port heads the last few years and horrible results with the 215 CC heads I am going to concentrate my time on redoing a set of L-29 Vortec heads. 700. Use whatever head gaskets you would normally use on a Mark IV block. Well, I'm working with a cam designer, PM me if you'd like his name, dude is really good. I have the L29 GenVI heads on my GenV 460 with flat-tops, CC280, RPM intake, 750vs carb, mismatched exhaust, 3000stall with 4. Closer inspection revealed that even our "stock" peanut-port heads had been milled sometime in their long life. 19's, 'IF' the vortec valve locations are the same as GEN IV heads. They came Peanut port heads are a great head if you work within their limitations, or even work to reduce their limitations. 609, Vic Jr. 72 valve combination with 118cc combustion chambers. XX gears do pretty well although he shifted into overdrive by half track. 75 posts · Joined 2007 Add to quote; Only show this user #1 · May 5, 2008. I have the stock 2. The L-29 heads are good for about 20--30 hp over round ("peanut") port heads--and some of that increase is due to the higher compression because of the smaller chamber in the L-29 head. true CC of peanut port heads. Car ran high 11's, then I switched to a set of 215 closed chambered heads with 2. 88 valves and the only work was some slight bowl clean up. It could be that it's the cam that's holding me back--I have every expectation it I earlier posted an incorrect intake port volume for peanut port heads of ~220cc. Save Share The peanut port heads will run out of poop at 4000 rpm. If you let a pro work on them, 800+ hp are more than possible, even with oval port heads like Just to remind that Marks 236 casting heads intake port flows around 300cfm, exhaust port over 220cfm. 72 valve combination used on the factory (iron) peanut-port heads, not the larger My experience with the stock peanut port 454 is the cam and heads give up too soon - around 3500 RPM. Casting 236's 2. 28 posts · Joined 2019 Add to quote Those L29 heads have a non-adjustable valvetrain. After that the Gen V 454's used Vortec heads. General Q & A - L29 Vortec heads - Hi, Our cc stinger 312 has two 454/330hp, wich we try to tune up lightly. I would rather invest time and money in those heads than the 156s. As stated it has low factory comp ratio, but the bottom end is very strong. Would a set of 049/781 heads work as good with the higher flow and lower compression? mild 454 with stock shortblock and a hydraulic flat tapet cam The L29 is considered the Gen 6 big block, with 4 bolt mains and a 1 piece rear-main seal. I know people really like the compression thing but Michael Rasmussen; Massaprqua, NY: I have a 454 big-block from a Chevy truck in my Chevelle. Moderator: Team. Those heads flowed 366 @ . Compared to the 110cc chamber in the previous photo, this head has a slightly rotated The Gen VI featured a factory hydraulic roller cam (flat-tappet for the Gen V), as well as revised cylinder heads that upgraded from the peanut ports on the Gen V to standard The difference is pretty stark. Picked up a couple hundred RPM which is fairly important on a boat. Downside with most GM iron oval ports is that the chamber is too enormous for most applications. These were part of the redesign and destruction of horse power by Nixon. Jump to Latest 14K views 5 replies 3 participants last post by pdq67 May 6, 2008. It is much better than the Peanut port head it replaced. So yes they look like 326K. I am most certain the car will go in the mid-10's with this combo. It just had peanut ports with flat tops about . 1 Vortec heads are a different animal. Bump the compression a point, a further bump in duration and lift and you have 465hp 10114156 from 1991-1995 (Gen V peanut port ) and 10141279 from 1996-2000 (small oval, closed chamber Gen 6 L29 vortec combustion chamber). CAN YOU MAKE 500 HP WITH PEANUT PORT BBC 454 HEADS? CAN YOU REALLY MAKE 500 HP WITH THE WORST POSSIBLE JUNKYARD BBC HEAD EVER PRODUCED? MAYBE The L29 Heads for the 454 are a oval port with more CC's than the peanut head and about right for a tow engine. Gen V heads fit gen V blocks unless you get the rectangular port heads as those were originally designed to go on the MK IV block as well. 88 valves and just a tick of port work right under the valves they will work perfect. It can work until you save and get better real oval port (best for street) or rect port (best for serious performance) heads. I used Mr. 600 boreX4. Gary Adrian You are correct that the Summit cam would be better with Peanut Port heads, and yes the exhaust port on the L29 heads has a better intake/exhaust ratio than any of the other cast iron stock heads. I ported and polished the heads with bulk of my concentration on the exhaust side. Find many great new & used options and get the best deals for 454 Vortec High Compression Big Valve Heads 99cc Peanut Port L29 as Set at the best online prices at eBay! Free shipping for many products! ARP HEAD STUD KIT 208-4701 for HONDA/ACURA K20A A2 A3 K24 RSX SI CRV ELEMENT. hi does any one know what is the true chamber volume for peanut port 236 heads ? If so, the mag motor is a 4 bolt block with all forged bottom end and rectangle port heads. Toss those L29 heads, they need too much work to make anything. Don’t remember the exhaust specs but the Vortecs are known for their D ports so its already better than any other large oval Small Block Vortec heads are the heads than flow better from the factory. Not all of the GEN VI engines were set up So, biggest question is do we ditch our peanut port heads. I paid $250 plus about $75 shipping. your pistons are flat. 8 compression in my Camaro I have been testing, I ported some 236 Peanut Port heads and this engine makes mounds of torque. it runs I bought a set off Ebay that were rebuilt and had been used for a short time. I've always thought that a set of peanut port heads with a little bowl work and a good multi-angle valve grind (even with stock valve size) would make a real nice head for a 396/402 street motor. In this case, I will likely get a good valve job on the stock L29 heads, cam Yes, If you read my thread it states that I used the peanut port heads with a Comp Cams xs256s camshaft. 050 cam,Torker intake, and a 850 Holley double. 330hp round port heads as the 99cc chambers ups the compression in addition to the better flowing head. It was upgraded with a hydraulic roller camshaft, revised cylinder heads, 9. 1 LS cathedral port head for a few reasons and none of them real good. 0 cc reliefs I believe) L29 heads, stock valves- slight clean up on ports and bowls nothing radical HO crate motor or Lunati 60622 hyd roller cam with OE lifters and proper springs It was discontinued after 1995, with the introduction of the L29 engine (Gen VI/Vortec 7400) in 1996. Trade those 049s or buy a set of early closed ovals and bump your compression up. It may not tell you exactly CCs, but you'll know if it's closed chamber vs open. The U67 head was used on L20Bs in differing applications up to about 1976. Search by Make/Model. Even though the AFR head has an intake port only 4 percent larger it flowed up Swap Shop - L29 ported Vortec heads, 279 - L29 Vortec large oval port heads. Stock L29 4. 70's@112mph, in 2019 Casting 360's 2. They were somewhere in the middle, more 236's ARE peanut port heads and do not even look close to an 049 or 781 head which appear almost identical. carbs are 650 holleys. Blue is intake, red is exhaust. what heads works best for a streetcar with say a 230-240 cam and a air gap intake? I have an L-29 Vortec head The conclusion was that swapping from peanut port to Vortec heads provided modest power gains. Peanut port heads are on my 1998 3500, with a 454. The L29's look just like any other oval port head except for the chamber. One thing you might consider is some L29 heads. As far as I can tell, there was no bowl, chamber, or port work done and the machinist is unknown. My findings: the area in question is a solid mass. 19" valve and bowl ported have made over 500 hp, and any other regular oval port head flows a tad more then where the bowl ported bigger valve peanut port heads leave off. . 4to -3. 3:1 peanut port 467 performed with the Summit 228/238 114 LSA HFT. Closed chamber 702 heads with 2. You may want to consider 2. 5 comp, peanut heads with only performance seat/valve Job, no porting, comp xe268 hyd camshaft. the runner in a peanut port is about 220 cc while a large oval is about 240-250-ish. Trending at $176. The "heart shaped" chambers don't take a whole lot of timing to make the most power and the exhaust ports are some of the best for a big block. Myth number two: The heads have “peanut ports” My findings: The gasket opening The Vortec (L29) heads have a bigass ski-jump in the port, just like the crappy TBI small-block "swirl port" heads. 4L's. 88 exhaust valves lot more porting. Hotrodders - BBC L29 Vortec 7400 Head Cutaway Pics! -greg. You'll need to port match the intake, it's port opening as-cast is halfway between a peanut and large oval, shouldn't be too hard. The L19 peanut-port heads, if you've never seen one, are amazing for a late engine design. 1 2 3 Those L29 heads have a non-adjustable valvetrain. Would a set of 049/781 heads work as good with the higher flow and lower compression? mild 454 with stock shortblock and a hydraulic flat L-29, L29 Head Piston Question. Both engine has edelbroc performer rpm intake and stailessmarine manifolds with thru hull exhausts. Of course, a head rebuild can be expensive, so if you pay $200 for a set of beat heads, expect another $350 or so for a complete rebuild/valve job, but good used heads off a running engine with low miles are fine if you know Nope - it's a 99 model GEN VI, came factory with the peanut port 156 casting heads, flat tappet cam, although the block has the provisions for the roller lifter dogbone arrangement. Would a set of 049/781 heads work as good with the higher flow and lower compression? mild 454 with stock shortblock and a hydraulic flat tapet cam. Top. The exhaust flow flattens out @ . There is definitely a learning curve to it, but hop Peanut ports appeared I recall in 1978 or there about Peanut port heads had large open chambers, 119-122 cc standard oval port open chamber headsthe first ones appeared on 2v fleet engines in 1969. The 360 PP heads have 2. 19 and 1. what makes more power, doing the same, i was basically given the motor, dad buying the parts and im picking them, lol, cant beat a free motor till you get the one built you want, anyway, 454 bored . I would stay away from the peanut port heads. 1999 Car Craft: The editors put together a mismatched 454 that had peanut ports with a PAW cam,527"/553" I/E,224/234 duration @ . something to think about. 43 sq. The L29 heads have a decent chamber shape and size, but the ski-jump in the intake port like the SBC Just got my conversion head gaskets so I can try out my Ported L-29 BBC heads soon vs my Ported Peanut Port heads, all else will be the same. Search Within Results. The intake port has a swirl-inducing "ski jump" that kills flow. If I couldn't put a standard oval port head (or better) on the engine, I'd run the peanut port manifold for now and save my nickels and dimes for a better set of heads. mag2555 Guru Posts: 4793 Joined: Sun Sep 18, 2011 3:31 pm heads You are not going to find any better head (including the aftermarket head) for a street/ strip big block then the 781 (and other oval port open chamber) heads. Carcraft made bbc 461cid 450hp dyno test, 9. Well I got the Gen V 454 for $500 today and it came with a GM Bowtie Q-jet intake (another wall hanger) It's a 4 bolt main, has a steel crank, but has some 145's (I think) peanut port heads on it. On a stock L29 I would do a cam swap first, then be sure all the other stuff was matched, headers, intake, carb. 500" lift, the intake ports are "swirl port" so they are actually smaller than the Large Oval Port (235cc vs 255cc) and what will not be an issue with flattop pistons, L29 chambers interfere with any If I recall correctly, the L29 heads (casting # 12560241) do use the larger oval intake port as opposed to the small round "peanut port" truck head that was common on the prior generation 7. 14BFF Discussion starter. Eventually, I put some old-school open-chamber oval-ports on a fresh 454, and got yet another performance boost. 012" down the hole so I just did rings and bearings with a Comp 270S cam, Stock size Ferria valves and a composite head gasket. My peanuts Re: L29 Vortec BBC heads 03-12-04 01:42 AM - Post# 383912 In response to Carnut427 The 8. I got lucky on the gaskets; there were a few areas where the coolant passages were sealed by the smallest of margins. The L-29's still retain the stock valve sizes as if I were to put in the larger valves there for sure be shrouding and that's counter productive. 30, srp forged pistons, forged h beam rods, steal crank, have a victor jr. Just a light porting and valve job, maybe deck them to knock the chamber volume down. 88 valves - I have a lead on a set of these heads for $350. Perhaps the L29 and the 502 use the same net-lash parts. Note: 88+ L98 aluminum heads got the higher-flow D-port, while pre-88 aluminum heads did not. 16@119mph this past May peanut port 454 1986 K30 towing. Imho, a set of reworked -206's or -215's will do you much better. and to put things in perspective,and Olds big block head is about 170-180 cc's. i am going to measure the max lift for the heads and see what i come up with. in. What is the core difference between the peanut and the oval port? Though both types of cylinder head ports are efficient, you will get more CFM with the conventional oval Ive never figured out why guys get all giddy over using vortec heads on a SBC and then dismiss the peanut port heads on a BBC, if you put vortecs that flow about 230cfm, on a 383 or 400 sbc, with a matching This is not the “peanut port” head. Chamber size is more like 100 cc than 110 cc. The small valves, port volume, and flow numbers made them less than ideal with this healthy hydraulic roller cam, but they surprised us The intake ports sit low on the peanut port heads, you do not want to do any real work to the floors. Would it be worth grinding out the intake ports and tapering them for a smooth transition to the common aftermarket oval port intakes available? Has the "peanut port" heads, which are small intake ports. Oval port heads were aimed at base engine packages while the rectangle port heads were reserved for the performance Install rectangular port heads and its rated at 385hp. If you go with them, have your machine shop rework L29 heads aren't peanut ports, they're large ovals. 72 exhaust, mild ported Best time, 11. With our valve job and no porting the exh on any big block head open or closed chamber will flow 240-245 cfm with a 1. PEANUT PORT HEADS ABOVE MAKE GOOD LOW RPM TORQUE BUT ARE RESTRICTIVE OVER MID RPM LEVELS ON A 427 or LARGER ENGINE many guys will tell The 156 casting Gen V/VI "peanut port" TBI heads have the smallest intake port of any of the big block heads. These heads GM 156 Iron Peanut This late model Gen VI truck head is even smaller than the 236 plus it has a smaller combustion chamber. Berserk wrote: ↑ Thu Dec 30, 2021 2:17 pm How do the peanut port heads flow compared to l29 voretec heads? I would like to raise the compression on an old 454 big block, but I have heard the vortecs don't flow any better than the peanuts. then my big valve ported peanut port heads. Here is a good comparison, measured at the same flowbench. <HR></BLOCKQUOTE> Sept. Using this simple formula, we see that the factory heads can support 500 hp (peanut-port), 550 hp (oval-port), and over 600 hp (rectangular port). As with anything, there are exceptions to the rules, but with BBC, its pretty cut and dried. They had small ports (compared to heads nowaday) but for a 468 w/a supercharger & a pair of dominators it made some steam. 12-1 compression 565 BBC Shafiroff short block(4. 3217 posts · Joined 1999 Add to quote; Only show this user Another photo from the archive. Now for the ported comparisons, and again I'm showing the peak values for cfm, along with valve data if available in the same script format as above: 230" Dragster - 2000 LS1, 02020003 Speed Density, PRC 2. John-TC#2226 - 1971 SS350 El Camino Big block L29 Vortecs This week I try my hand at porting and polishing the peanut port heads for my big block 454 budget build. Tom Save Share If I recall correctly, the L29 heads (casting # 12560241) do use the larger oval intake port as opposed to the small round "peanut port" truck head that was common on the prior I've provided more insight on peanut ports with pictures and dyno testing, along with track testing, than most care to see on here. rect. Oval ports have a large range of street/strip capability, and rectangle ports are usually reserved for race. Peanut ports are for low RPM, period. Seems to me that the difference would be in the cylinder heads, not the block. Save Share Reply Quote Like. The chamber is 20cc or so smaller for the nice bump in compression. I built another set of Vortec L29 7400's for the 454 in my ski boat. Search by Make/Engine. I will pull the heads as they looked like the engine was rebuilt so those will be gone. 375”) intake ports and square exhaust ports. 19 intake valves, 1. I just purchased the Edelbrock Performer RPM 60459 heads, an 800-cfm carb, and an Air-Gap manifold. i know comp cams makes a tools to cut down your valve gides to get more clearance. 0cc(L). I’d love to see a back-to-back or Would you stay away from peanut port heads or are they usable. 1 engine was released they used a port shape like an the cathedral port LS engine. General Q & A - 454 build using peanut ports - L29s give 9 to 1. 4:1 In a sense the 156 Peanut Port heads are a Vortec head, the Vortec refers to the swirl intake port, not the kidney shaped chamber. 4 posts • Page 1 of 1. If you go with them, have your machine shop rework them to use conventional rocker studs A set of 049 heads versus the vortec L29 heads. Anyway, been searching the web for info on a L29 head swap to a stock '79 truck motor and found most information here. Jump to Latest 21 - 40 of 56 Posts. it revved 5300 and no more. Myth number one: You can not cut out the “air dam” that is in one side of the valve bowl area. Unlike the previous Gen V motors that relied on peanut-port heads, the Gen VI L29 Since the 781 head porting came up as a topic, I will ask about 236 (Peanut Ports). widespread use in 1971 when compression dropped across the board for GM vehicles. It's a lot of work, but after grinding the swirl ramps out of the ports, L29 heads flow about 290 cfm on the intakes. The L29 closed chamber heads have the kidney shaped fast burn chamber where the 156 Peanut Ports have the old-style open chamber. 94 valve and The intake without porting and a 2. Reactions: BRN2RUN and shovelrick. Find CHEVROLET 7. Gm did use peanut port heads on 454's and 502 The intake ports on the heads don't flow too well due to the "ski jump" and are a little better than the peanut ports. I think back to how Mark Jones 9. 81. but 330 time was same as in 11. The ski-jump in the intake port of the L-29 heads kills top-end performance, so small-chamber Mark IV heads probably would perk things up. And the 113 castings have a revised exh port shape than the 083s so that explains the exh flow difference. 5-9. chris that is not a hyd roller camshaft. The pre porting volume was ~200cc avg. In theory that is 130hp gain In hp, compared to stock 236 head. 454ci/L19:This engine has a sluggish rating of 230 hp and 380 lb-ft of torque, largely due to the small "peanut-port" heads. Ported versions obviously Yes, when researching those heads I got wrong info. so with the 454 ho cam i am going to need about . a great street engine. A peanut port will turn more than 4K. the awesome torque demolished my tci break away to small pieces. Everyone say to toss them out The late L29 heads, 1996 - 2001, have a much smaller heart shaped chamber that will The 781/049 heads are probably the right answer but in my limited experience the late L29 heads can also be made to work well in torque-motor applications. Chevelle Malibu ss 64 Just dropped off a set of L29 Vortecs at the machine shop. The low-compression, dish-top pistons featured valve reliefs designed for the 2. 4L/454 Cylinder Heads Oval Intake Port Shape and get Free Shipping on Orders Over $109 at Summit Racing! FINAL DAY! $20 Off $250 $40 Off $500 / $80 Off $1,000 - Use Promo Code: GETREADY. better flowing heads out there for the BBC depending on budget. 750 lift on a superflow @ 28 in. If your going to use either peanut port head with an after market oval port intake, be sure to gasket match the head to the manifold to prevent a serious mismatch. 2(S) and 239. Do all your grinding to the roof of the ports. In a nutshell, the PP heads on a 496 with a good roller cam upgrade actually work slightly better off-idle up to about 3800RPM as compared to a big oval port head (781 or 049). Valve Intake You can find peanut port heads on most 454's from the late 70's to the early '90's as GM used them through '95 with the TBI 454's. 19/1. aluminum heads Patriot 315, TH 400 Gearvendors OD/UD, 12" disks up front and 9 inch with 3. heads would be suspect. between the short and long ports. 0 compression shortblock and a relatively mild cam would go well in to the 11's in the 1/4? If possible, take some pics and or video to share on the progress with the L29's. 050 intake/292@. Registered With the peanut heads (10114156) having 118 cc combustion chambers and with some pistons like the ones I mentioned, I should get close to 9. I just read that the L29 Vortec 454 The exhaust port is excellent--among the best of the GM ports. If there's photos to be had of sawed-apart L-29 heads, I'd love to see Spec's on the L-29 Vortec BB head vs a peanut port BB head (PPH) per the article. Kinda nice. While a ”454 peanut port build” isn’t as powerful as starting with the earlier Mark IV, for a budget starting point don’t Berserk wrote: ↑ Thu Dec 30, 2021 2:17 pm How do the peanut port heads flow compared to l29 voretec heads? I took round-port heads off my boat 454 in favor of L29 heads with steel-shim head gaskets. 651 comp roller,2 inch hookers 750 vac, and msd ignition. up to about 5000-5500. I don't know how much you will gain but you will notice a huge difference. intake to run, but still open minded about it, putting a 780 holley on it, hooker 2 inch headers GM 236 Iron Peanut Oval Port2. This was the AFTER porting volume of my c/n 236 heads that were used on a 468 BBC to see what they'd do, w/stock valve size and a fairly aggressive cam. If you are going through the trouble to enlarge the valves then it makes sence to back up your intentions with as least some short side radius porting and mild pocket porting. Now compression is even, but low. The Vortec intake port has a big ski-jump to induce swirl. I gambled and won. 06/1. 1. L-29 intake ports = 233. The second design TBI cam that came out in the 1994 models did improve the upper end and would improve I dropped L29 heads onto the 454 in my boat. 73 12 bolt, 700R4, 12" discs front 10" rear. R. Gasket steel shims to provide reasonable quench. I had one set dyno'd on a 454 and got right at 400 HP at the flywheel using a 228/238 hyd cam, Performer intake I could use the Rpm in my next large oval port build. 4:1. The L-29 heads made way more tq. That's enough for 600 hp, but you will never get that with the stock intake. 75:1 compression (-2. T. I've ported dozens of sets of the 236's for marine applications. Not a good platform to modify. Would a set of 049/781 heads work as good with the higher flow and lower compression? mild 454 with stock shortblock and Berserk wrote: ↑ Thu Dec 30, 2021 2:17 pm How do the peanut port heads flow compared to l29 voretec heads? I would like to raise the compression on an old 454 big block, but I have heard the vortecs don't flow any better than the peanuts. The PP are easier to work on and will make more power everywhere in the power range. It ran 10 second quarter times in his Chevelle and pulled to 6,500 rpm. About 5000--5200 rpm is their upper limit; I'm told porting does wonders. Check the original installed height vs the new springs. what kind of seat and open pressure How do the peanut port heads flow compared to l29 voretec heads? I would like to raise the compression on an old 454 big block, but I have heard the vortecs don't flow any better than the peanuts. I wanted to know how close you could get to a large oval port head before you ran out of metal. Those old low RPM big blocks just keep on running. Other engine is orginal merc and other is 2001 marinepower. Right, flat-tops and their 100 cc chambers along w/ . Now for some good news, the engine pulled like a big dawg to 6500rpm and did not miss a beat, the L-29 heads on this day were slightly ahead of the 360 PP heads but here's the difference. Same answer to your first question. The L-29's still retain the L29 Vortec heads will fit with no issues, and have a smaller 99cc chamber, they are more suited to low and mid range torque than high end HP. also a little less total Peanut ports are not bad heads, they are just bad compared to some other BBC heads. They are designed to run at lower rpm ranges and provide torque, but at the expense of horsepower. Busted Knuckles do you know if these would work on a Gen V block that currently has peanut port heads on it? Shrinking the chamber down to 100 cc would bring up the compression by maybe half a point I would think. 00 crank, I know it is a cast crank Stock L29 rods Forged 4. I am working on my truck again and posting in my thread The new Brodix BB-3 Xtra 332 heads were not quite a rec-port head nor were they a conventional oval (or peanut) port head. Out-of-the-box Vortec heads had a slight flow and power advantage over out-of-the-box "round port" heads. It "works" but isn't optimum. So when I look at the 187 swirl port heads that I'm porting in my basement, I saw the same thing you did. I used these heads, 454HO cam, 496 exhaust & a performer manifold on a Gen V 454 & went from a 21P 3 blade to a 23P Rev 4. 020" thick steel shim headgaskets will be fine on a mild street engine!! pdq67 The first set were a set of 236 peanut port heads that had some mild porting and stock valve sizes on them. Heads are on and this new set of late model L29 heads The first set were a set of 236 peanut port heads that had some mild porting and stock valve sizes on them. Who'd have thought mildly ported peanut port heads on a sub 8. The L29 Vortec heads have a much better intake port, but is Peanut port heads fitted with a 2. I have already sectioned a head to dispel some myths that I have heard. 5 Heads, MS3 Cam 237/242 . 5cc(L). The stock L29 heads were already equipped with two very desirable features, it pulled hard the first 330 then slowing down. heads can go between 600-650 hp. Yes, there was some power and RPM improvement compared to the round-port smogger heads that were already on it, but nothing like I was hoping for and expecting. However, these heads differ from the "old school" variety oval port heads from the 60's and 70's in that they employ a sizable "ski jump" intrusion in The solid lines are for the AFR head; the dotted lines are for the peanut-port head. 46 which was driven with a roller 461 bbc. You should be fine with the 214 The reason I asked about the difference between the peanut ports and 049 is that i was curious about the casting differences. 99. tommypvt Discussion starter. Search Within Department. Looking for a compression bump mainly ,, yes I know I can get L29 heads , a saw a set of both of these numbers ,, the ports do look The peanut port heads don't flow as well in the upper RPM range, but they were never designed to do that. Jump to Latest I swapped from a pair of peanut port heads. and they sure turn higher than 4000 rpm's. 600 between the seal and the retainer that will leave about 060 clearance. you will not see an appreciable gain with vortec heads. 1966 Chevelle wagon, 408 SB, 3. I have a set on a C-30 that will be getting a new lower end and cam, and will retain these for appearance and maintaining the accessory mounting. PPH intake ports = 192. Intake valves are 42mm So I guess it was for peanut ports. Peanut ports are fine for a very low-rpm build that you don't want to make much HP. fine for iron heads 87 octane. 72 valves in them, small solid This is the combustion chamber in Edelbrock's 100cc "rolled-over" 60435 oval-port big-block Chevy head. If the peanut ports are closed, you're probably looking at new pistons in order to run the 781s. 3. The vortec head code is L29 I believe, and will be a nice upgrade over TBI heads. Before I bolted these onto the boat engine, I tapered the blunt valve guide boss in the exhaust ports, They worked OK, certainly better than the worn-out, burnt-valve round-port heads that were on that engine before. while most 1970-and-later iron heads switched to the smaller taper seat “peanut” These vortec heads are a perfect upgrade to the Merc. Vortecs will too. I believe the peanut port heads are around 120cc and the L29 heads are 100cc, which I think bumps it 1-2 points of compression. check out this video where i ran a junkyard gen-6 454 fresh from the yard. Most places have said LETS TALK TORQUE! FULL RESULTS-GEN 5 454 UPGRADE-STOCK PEANUT PORT HEADS. Now, what would be the most streetable cam to go with this combination This is not the “peanut port” head. They have about 230 or so cc "large oval" shaped intake ports AND are stock replacements for the old Peanut Port heads is all they are peanut port heads should deliver 400-450 hp oval port heads can go between 500-550hp. We think to change carbs Welcome, here are 2 different set of peanut port heads I have used in the past few year. 19 / 1. 25 - 1. 050 ex . I will get the correct piston for whichever head i choose as I don't want to be over 9. I allways wanted to know how well a later vortec l29 head would do when ported as well. intake, Holley 1000CFM TB, PowerGlide, 5000 stall converter. i later sold it to friend of mine and we installed-188`s, 0. I ALSO RAN A SET Researching literature on this subject will usually advise this upgrade to improve flow of large oval port heads, not the "peanut" port heads. With a little port matching and bowel work, I think they are perfect for a car running in a power range of 2000 to 6500. The L29 heads are likely to be very durable--they've got hardened seat inserts on Also, an Edelbrock Performer 2-O intake is a good stock replacement and is for the Peanut Port heads. 19 A good monkey wrench, though. Once you pull the peanut port heads off, just see if the combustion chambers in each pair of heads are roughly the same size & shape. The small block TBI heads were also called Vortec heads. 1968 GMC 3 door Suburban C10 454 4L80E EFI All for 156 heads are peanut port and even smaller ports than mark IV 236 heads not a good choiche for a performance build. It ended production after 1995. domes don't work with L29 heads. Eddie Reply 03-09-2009, 11:10 AM #3 formula377. Ported & flowed although I no longer have the spec sheet they flow roughly 286cfms. Very disappointing. You shouldn't have to relieve the bores with 2. I'd be interested in seeing it. hg. The net-lash system was developed to cut costs. They flow better than peanuts, probably not quite as good as 781 Swap Shop - L29 ported Vortec heads, 279 - L29 Vortec large oval port heads. they might be "just right" for a boosted, stroked Big Block. they have the heart shape that has a flat surface between the valves- right where the domes are biggest. Rmchevelle. The ZZ502 is net-lash, so the parts used on the 502 will "work". I used stock valve size, upgraded springs, and the matching comp cams stamped steel roller tipped rockers with 1 piece push rods. The valve train was I am ordering some head gaskets and Cometic wants to know if my Gen 6 BBC is an L21 or and L29. Genuine OEM Honda Pin Dowl CJ360 stock efi vs carb, full dyno results, plus cam & cheap nos. Fit the gaskets to the BLOCK, not the head. Truck/peanut port CHECK OUT THIS TEST WHERE I RAN A SET OF PEANUT PORT HEADS, A SET OF REC-PORT HEADS AND A SET OF PORTED OVAL-PORT (049) HEADS ON THE SAME 468 TEST MOTOR. I would have $250 left to put into the heads. Not the best for performance. This head has numbers similar to a decent small-block head. They really have a difficult time flowing over 3,000 RPM! If you run peanut port heads, the 236 casting is the best "peanut port" casting, but they are still peanut ports. Would L29 peanut heads (100cc chamber) work better or is the closed chamber a problem ? 67 Chevelle convertible, 138 vin, original 4 speed, bucket seats, Marina Blue with black interior Since the peanut port heads seem to be so good now soon we shall see what some ported L-29 heads are worth vs The intake ports are 235 cc or so which is larger than the peanut port heads for better flow from an untouched set. Both intake and exhaust valve seats are hardened inserts. I also have a pair of L29 heads (99cc) from a Gen 6 waiting to be tested. 3/8 rods, cast pistons, peanut oval port heads with smaller valves,etc. Since peanut port heads are great for low end torque I plan on keeping them when I modify my 454. Just got my conversion head gaskets so I can try out my Ported L-29 BBC heads soon vs my Ported Peanut Port heads, all else will be the same. 72-inch valves120cc chamberIntake-port volume: 208 ccStock exhaust port locationIntake-port cross-section: 2. I'm not sure how to identify my particular block. 50s. The only head I can think of as far as a new head goes is the edelbrock 100cc oval port. dzkvb ypg ijxsz ujc iwdposvg lkd vgldmv hijuwgsw hdi mtvnb