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#1
07-01-2017, 04:07 PM
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New 76 TA, motor upgrades?
Howdy all,
I just picked up an original 76 TA, 400 4 speed car. It has never been apart, has 90 K on it, and runs and drives very well. My question is, if I choose to rebuild the engine-original block and heads-what would be the best way to increase horsepower and torque? I am considering adding earlier heads, cam and having the carb rebuilt for my new mods and altitude. I want the car to be kept original for shows, as far as that goes, so I am unsure about headers. Any suggestions? |
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#2
07-01-2017, 04:38 PM
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Use a stroker crank kit to gain cubic inches.
More power gains from that. 
__________________
John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#3
07-24-2017, 10:14 PM
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I wouldn't stroke that original block. Build another stroker and save the original motor if you ever sell it.
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#4
07-25-2017, 12:47 AM
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Quote:
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#5
07-25-2017, 12:58 AM
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"... I am considering adding earlier heads, cam and having the carb rebuilt for my new mods and altitude. I want the car to be kept original for shows...Any suggestions? "
If you add earlier heads, it is no longer "original for shows". Would look more original to use your 6X heads on a 455 or non-original 400 stroker shortblock. Hey, the '76 was the last year that used a 455. http://lenwilliamsautomachine.com/455_Short_Block.html http://lenwilliamsautomachine.com/455_Long_Block.html "...I am unsure about headers..." You can go with RA3 type exhaust manifolds. Not original, but look closer to original than headers. https://autoplicity.com/11126028-pyp...xoCtdkQAvD_BwE https://www.summitracing.com/parts/p...BoC-e0QAvD_BwE Last edited by ponyakr; 07-25-2017 at 01:08 AM. |
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#6
07-25-2017, 10:05 AM
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I agree with the gang.
- pull your original motor, seal it up, and store it safely away - get another 400 block, and install a stroker kit - get another set of 6X heads, consider have SD Performance CNC port them and set them up for whatever cam you choose to use - 2.5" outlet Ram Air exhaust manifolds will make it look "stock'ish", and you can tweak some heat shields to further disguise them.
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'73 T/A (clone). Low budget stock headed 8.3:1 455, 222/242 116lsa .443/.435 cam. FAST Sportsman EFI, 315rwhp/385rwtq on 87 octane. 13.12 @103.2, 1.91 60'. '67 Firebird [sold], ; 11.27 @ 119.61, 7.167 @ 96.07, with UD 280/280 (108LSA/ 109 ICL)solid cam. [1.537, 7.233 @93.61, 11.46 @ 115.4 w/ old UD 288/296 108 hydraulic cam] Feb '05 HPP, home-ported "16" D-ports, dished pistons (pump gas only), 3.42 gears, 275/60 DR's, 750DP, T2, full exhaust |
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