429 Cobra jet heads

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429 Cobra jet heads

Post  Roger Dyess on June 27th 2017, 1:31 am

Who can set these heads up for a 521 build for a Bracket car ?
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Re: 429 Cobra jet heads

Post  rmcomprandy on June 27th 2017, 4:27 pm

Roger Dyess wrote:Who can set these heads up for a 521 build for a Bracket car ?

I'll recommend anyone on here who does cylinder heads for a living ... I would choose someone closest to your location.

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Re: 429 Cobra jet heads

Post  dfree383 on June 27th 2017, 5:27 pm

Don't really need Max effort heads on a 521 bracket motor IMO.
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429 Co fa Jet heads

Post  Roger Dyess on June 27th 2017, 10:39 pm

Thanks for the advice and effort to do so. I have learned that improving any part of the drive train significantly , ripples through the combinationfront front to rear. It's my heads time to be improved. I have prepared the balance of the combination to handle a step up. I guess I have not done sufficient reasearch to know what horsepower upgrade I can get out of these heads while staying at 521. I'm a horsepower racer no boosters. Can't afford turbos of nitrous rebuilds. Thanks again. I will rethink the question
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Re: 429 Cobra jet heads

Post  Mark Miller on June 27th 2017, 10:49 pm

Roger Dyess wrote:Who can set these heads up for a 521 build for a Bracket car ?

A-429 Aluminum CJ heads or cast iron i would think cast iron 429 Cobra Jets?

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Re: 429 Cobra jet heads

Post  68galaxie on June 28th 2017, 3:04 pm

Agree with Randy.
Also if you are talking about the factory iron CJ heads you will be far ahead using a custom designed camshaft.
Several here that can help greatly with that as well.

Cheers
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Re: 429 Cobra jet heads

Post  Rickytx630 on July 2nd 2017, 11:47 am

i just took my A429 cjs off the 514 to be replaced with the p51s, motor is mild nothing too crazy, been 9.12 @148. 14:1 comp.

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Re: 429 Cobra jet heads

Post  Lord_Vader on July 26th 2017, 7:47 pm

Rickytx630 if you need a new home for those a429 heads I've been on the hunt for a set

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Re: 429 Cobra jet heads

Post  BOSS 429 on July 26th 2017, 8:00 pm

Rickytx630 wrote:i just took my A429 cjs off the 514 to be replaced with the p51s, motor is mild nothing too crazy, been 9.12 @148. 14:1 comp.

what kind of car is it in?
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