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Camaro Research Group Discussion => Mild Modifications => Topic started by: crossboss on November 07, 2019, 11:47:51 AM

Title: Mark IV Big Block exhaust manifolds
Post by: crossboss on November 07, 2019, 11:47:51 AM
Boys,
Need a bit of advice/help on this one. What Mark IV Big Block cast iron exhaust manifolds flow the best with square port heads. I am not chassis restricted, so no worries there.
Title: Re: Mark IV Big Block exhaust manifolds
Post by: firstgenaddict on March 31, 2020, 06:56:50 PM
The corvette style are the better cast iron "manifolds".
The 4 branches come together more like the old SD pontiac "header" exhaust manifolds on the 421's.
Title: Re: Mark IV Big Block exhaust manifolds
Post by: crossboss on April 09, 2020, 01:33:34 PM
Quote from: firstgenaddict on March 31, 2020, 06:56:50 PM
The corvette style are the better cast iron "manifolds".
The 4 branches come together more like the old SD pontiac "header" exhaust manifolds on the 421's.




Thanks, much appreciated!
Title: Re: Mark IV Big Block exhaust manifolds
Post by: firstgenaddict on April 20, 2020, 10:25:59 AM
You could "EXTRUDE HONE" them as well...
Title: Re: Mark IV Big Block exhaust manifolds
Post by: crossboss on April 20, 2020, 05:45:41 PM
Quote from: firstgenaddict on April 20, 2020, 10:25:59 AM
You could "EXTRUDE HONE" them as well...



Yes, that was also in the plan to do list.
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