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#1
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*NEW UPDATED* W72 Build Plans, Getting Stroked
Good Evening everyone, as many of you are aware of from my other W72 build thread, we are getting ready to build yet another Pontiac 400, this time a 1979 PWH W72 400 out of a Trans Am. The original plan in my other thread was to upgrade the 400 as much as possible while retaining the numbers matching parts on the outside, but after calculating the cost of good pistons, better 5140 rods, and having the crank turned and everything balanced, it comes within a few hundred dollars of just buying the Butler Performance Balanced Stoker rotating assembly ready to install, after I get the block decked and bored, and the end result is much better parts for the money, a bigger 467 c.i. engine, while retaining the numbers matching look to the eye. At this time there will be no head porting in the budget, just a nice rebuild and valve job on the 6x4 heads, upgraded with Ferrea stainless valves, Crower 68404 springs set up at 1.570" Installed Height, and 7/16" studs and poly locks. This engine should come out somewhere between 9.6 to 9.8- 1 compression. We are now thinking we will use the Lunati VooDoo 704 camshaft in this. Here is how the build plan looks now
1979 PWH 400 XX block Bore- 4.181" Zero Decked Butler Performance Rotating Assembly Eagle 4.250" crank Eagle 6.800" H-Beam rod Ross/Butler 8cc Flat Top 2VR piston Total Seal Plasma Moly rings Melling M54DS pump Stock (non ported) 6X4 heads, 7/16" Studs and Polylocks, Ferrea Valves Felpro 1016 .039" head gasket Quench .039" Compression- 9.6 to 9.8-1 Lunati VooDoo 704 Camshaft 276/281 Advertised Duration 233/241@.050 .504"/.527" lift 110° Lobe Seperation Thinking of Installing it at 104° I.C. according to the advice of Harold Brookshire and Paul Carter Crower Camsaver lifters Crower 68404 Valve Spring installed at 1.570" Cloyes 3512X9 billet timing set Stock 1.5 rockers Stock Cast Iron intake Qjet Recalibrated with Cliff Ruggles parts Recurved HEI distributor 1 3/4" headers, dual 2.5" exhaust Super T10 4-Speed Manual transmission 3.23 rear gears This is 100% street car on pump gas in an original 1979 Trans Am. What do you'll think about the new stroker plans? I know head porting would be even better for the bigger engine, but it is not in the budget at this time. Sound like a good plan? Thanks
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1978 Trans Am Pump Gas 461 Stroker Last edited by TransAm 474; 03-14-2021 at 12:34 AM. |
The Following User Says Thank You to TransAm 474 For This Useful Post: | ||
#2
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To help that late production block live with that .060” overbore you going to want to do a half fill on that block!
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#3
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Build looks good, hopefully it's a later 4 speed block. I'd opt for the forged crank option. I've seen just enough of the Eagle cast cranks break to avoid them, if nothing else you'll sleep better at night. Never tried one of those cams but I have had Lunati grind several custom cams for us on wider LSA's with excellent results. Most recently they did a cam for us for a 425 Olds build, then another for an Olds 455. Both were in the 230-240 @ .050" range moved out on a 113LSA. Good idle, throttle response, street manners and no issues whatsoever on pump gas with mid 10's for compression........Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
#4
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That's our recommended build for the 78 and 79 400's. We build a lot of them. You can save money by using a cast crank, cheaper forged rods and put that money towards some head work and pick up extra power.
You will need to swap out the flywheel because the aftermarket cranks use the 2.75 hub |
#5
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its an XX W72 block, cast from the early 481988 blocks. no need to fill it for a street car.
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The Following User Says Thank You to 78w72 For This Useful Post: | ||
#6
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Quote:
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1978 Trans Am Pump Gas 461 Stroker |
#7
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Quote:
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1978 Trans Am Pump Gas 461 Stroker |
#8
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Yep, its the original 481988 PWH XX block
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1978 Trans Am Pump Gas 461 Stroker |
The Following User Says Thank You to TransAm 474 For This Useful Post: | ||
#9
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The extra stroke will get the CR better also. If you are going Ferrera valves I'd still go longer so you have a better IH.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
The Following User Says Thank You to Skip Fix For This Useful Post: | ||
#10
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Thank Skip, but unfortunately we already have the Crower 68404 springs, so we will have to make do Lol. It will always retain the stock 1.5 rocker though.
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1978 Trans Am Pump Gas 461 Stroker |
#11
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That is what the "For Sale" section is for
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
The Following User Says Thank You to Skip Fix For This Useful Post: | ||
#12
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Quote:
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1978 Trans Am Pump Gas 461 Stroker |
#13
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Thats a great point! 😂
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1978 Trans Am Pump Gas 461 Stroker |
#14
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Interesting build, what horsepower are you shooting for/expecting? How come you're not keeping manifolds vs headers while retaining numbers matching parts throughout?
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Chris D 69 GTO Liberty Blue/dark blue T400, 9" w 3.50s, 3905lbs 461, 850 Holley, T2, KRE 310s, Comp HR288 w 165s, RA manifolds, 11.60@114, 1.58/60 The spare: 467, 850 Holley, T2, Edelbrock Dport 310cfm w RA manifolds, HFT 245/251D .561/.594L, 11.59@ 114, 1.57/ 60' |
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#15
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Thanks, the car already had headers on it, and exhaust would have to be redone in order to run a set RA manifolds
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1978 Trans Am Pump Gas 461 Stroker |
The Following User Says Thank You to TransAm 474 For This Useful Post: | ||
#16
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Evaulate what the pressure will be with the Crower 68404 valve springs at your VERIFIED installed height. With that in mind take notice that based upon his dyno testing and extensive use of Voodoo cams Paul Carter recommends 130-135 lbs seat pressure with 30 degree seats and 330-340 lbs open pressure with the Voodoo hyd flat tappet lobes. Less pressure ok with 45 degree seats, still shoot for 110-115 at least for the Voodoo 702 & 703.
Also he suggests to keep the distance from coil bind around or under 0.100". Also keep in mind valvesprings will lose pressure after run in. .
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
#17
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Quote:
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The Following User Says Thank You to PAUL K For This Useful Post: | ||
#18
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I love PY, So much knowledge in these pages.
GT. |
#19
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I agree! By far, the absolute best Pontiac forum there is. I can read about camshaft and engine information for days straight here in the Street section Lol
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1978 Trans Am Pump Gas 461 Stroker |
#20
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That's a pretty choppy cam if ground on a 110 LSA. Not saying it won't work, at all, but be prepared for a pretty rough idle.
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs |
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