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#1
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468 final specs
OK, so after lots of thought, advice from members and reading lots of old threads this is what I've come to.
-468 cid -IA2 block -SCAT forged crank -Eagle forged H beam rods -JE flat top pistons -10:1 CR -Ebrock 87 cc D-port heads (stock) -Butler 8030 HR cam (changed from CC XR288HR): 236/242 @ 050, 521/540, 112 LSA (CC cam was the same but 110 LSA) -Crower steel 1.5 rockers -Johnson lifters -Ray Klemm Qjet -Stock intake -RAIII exh manifolds Car is a 70 TA, M20, 3.31 rear, no AC I think that's it. Almost all parts are in hand (block and cam are in transit). Hopefully will be in the car and running within 2 months.
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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear https://youtube.com/shorts/gG15nb4FWeo?feature=share |
#2
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It all looks good, but to truly take advantage of the air flow levels you payed for with those heads you should consider at some point changing over to the performer rpm.
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I do stuff for reasons. |
#3
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You'll love it, close to my setup and it is fun as hell!
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Let's make welfare as hard to get as Veterans benefits! |
#4
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Any consideration to increasing the bore to take advantage of the IA2 block? I assume the crank is a 4.25" stroke.
If I could build from scratch like you I'd go with around a 4.30" bore and 4" stroke
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James 1970 Trans Am Spotts Built 484" IA2, Highports, EFI Northwind Holley Terminator X sequential EFI fabrication and suspension by https://www.funkhouserracecars.com/ |
#5
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Yep, it's 4.25 stroke. I've already got the pistons. We had them custom made for the WS block I was going to use that's 60 over and we were going to go to 65 over. That's actually one of the main reasons I decided to go with the new block. If not for that I may have even gone smaller on the bore. I don't really want to find myself much above 500 hp/550 tq and I think I may already be past that.
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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear https://youtube.com/shorts/gG15nb4FWeo?feature=share |
The Following User Says Thank You to jhein For This Useful Post: | ||
#6
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Quote:
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#7
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Do you have the small bore IA block now? If not good luck getting one with that small bore, itll be a long wait
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#8
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Nice mild reliable combo with that light aluminum block should be real fun. But I personally would be building up this engine to be 650-700 hp/tq on pump gas ;-)
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#9
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It's been shipped... So, no I don't have it, but barring any catastrophe it should all come together. I've got my fingers crossed.
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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear https://youtube.com/shorts/gG15nb4FWeo?feature=share |
#10
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It's the iron block, not AL.
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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear https://youtube.com/shorts/gG15nb4FWeo?feature=share |
#11
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I'm curious if you have done any dynamic compression ratio calculations with this combo. Pretty mild combo. Should work very nice with power brakes.. Should have good vacuum. I'm thinking around 500 H/P Are you gonna dyno the engine after built? You'll need a good fuel system to keep q-jet happy. Thanks https://www.gofastmath.com/Compressi...tio_Calculator
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68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 4:11 gear. 29" slick. Best so far 9.95@134 mph. 1.43 60 ft. 76 Trans am, TKX .81 o/d, 3.73 Moser rearend, 468 with KRE D-ports, Doug headers, 3" Exh. Last edited by chuckies76ta; 03-17-2022 at 06:55 AM. |
#12
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I hope you have this engine dyno'd. Will be be very interested with output. I am running two 461's. one is in a '70 GTO the other in '78 T/A. Differences include round port edelbrock heads and ported, original block, off the shelf XR288HR that you first considered, edelbrock performer RPM, Doug's long tube Headers @ 1 7/8 primary and 3" collectors. Compression is 9.5 to 1. I was given corrected and uncorrected numbers and I'm beginning to think the uncorrected numbers are the correct ones. Uncorrected numbers for the '78 are 553HP @5,500 RPM and 593 TQ @ 4,200 RPM. The '70 GTO uncorrected numbers are 560 HP @ 5,500RPM and 595TQ @ 4,200 RPM. Add 30 to each number for corrected number. Was told the dyno had to be recalibrated and this was the change. Both engines have the same recipe.
I agree 500HP is gone. My guess is 520-525HP. Good move on the 112 LSA with the exhaust manifolds. Should help out with power brakes. |
#13
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Yes, it's going to be Dyno'd. I'm gonna have it done with the RAIII mani's on it. But, it still won't have the air cleaner, fan, PS pump and alt on it. I can live with 525 neighborhood.
Napster, you have 1.65 rockers on your cars, correct? Yeah, I think the 112 LSA will be a good thing. The other change that I forgot to point out was the lifters. I had Morels but switched to the Johnsons. They make 3 different travel lifters. The standard which I think is 1.2 a short which is .58 and a reduced travel that is .93. I have the .93 version.
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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear https://youtube.com/shorts/gG15nb4FWeo?feature=share |
#14
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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear https://youtube.com/shorts/gG15nb4FWeo?feature=share Last edited by jhein; 03-17-2022 at 12:08 PM. |
The Following User Says Thank You to jhein For This Useful Post: | ||
#15
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#16
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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear https://youtube.com/shorts/gG15nb4FWeo?feature=share |
#17
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I'll disagree- making much over 500 with a factory intake and a factory exhaust manifold is going to be tough, especially if there is any porting on the heads.
My first E head motor I ran an HO intake and a worked Qjet, then added an adapter and a 850 DP and picked up 0.3 seconds at the track(same day swap). Swapped a Torker II on and it was a different motor all together. Going fomr high 11s to low 11s, 10s with a convertor change. My current 466 in the 78 TA dynoed 525 on a conservative dyno, calculators show 550-575 based on weight and MPH. Torker II 850 DP , headers and 3" exhaust. Perfect air at 3750 lbs clicked a 10.90 @ 124. Not going to happen with RA exhaust manifolds. Even Lee Atkinson with some dinky headers on a stock 455 iin his Firebird picked up a bunch of HP on the chassis dyno over manifolds.
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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 |
#18
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I don’t know the “condition” of the stock intake the OP’er is using, BUT, Dave Bischoff says his “most” modified version of a stock intake will support 600 HP.
We need Cliff’s 2 centavos on this thought. Not trying to be a Beavis here, just wondering....468 cubes....... Skip is your Torker II STOCK?
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1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
#19
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But again, my goal is not maximum power. I just want more than stock power with a rock solid rotating assembly and valve train. I realize I'm getting very close, if not past, driveline parts breaking territory. But, I think with street tires and my driving style I'll probably be OK.
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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear https://youtube.com/shorts/gG15nb4FWeo?feature=share Last edited by jhein; 03-17-2022 at 02:49 PM. |
The Following 2 Users Say Thank You to jhein For This Useful Post: | ||
#20
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Not sure a Perf RPM Would fit under the hood of your TA.......
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1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
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