Author Topic: Mark IV Big Block exhaust manifolds (Read 5547 times)

crossboss · « **on:** November 07, 2019, 04:47:51 PM »

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.

firstgenaddict · « **Reply #1 on:** March 31, 2020, 11:56:50 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.

crossboss · « **Reply #2 on:** April 09, 2020, 06:33:34 PM »

Quote from: firstgenaddict on March 31, 2020, 11:56:50 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!

firstgenaddict · « **Reply #3 on:** April 20, 2020, 03:25:59 PM »

You could "EXTRUDE HONE" them as well...

crossboss · « **Reply #4 on:** April 20, 2020, 10:45:41 PM »

Quote from: firstgenaddict on April 20, 2020, 03:25:59 PM

You could "EXTRUDE HONE" them as well...

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

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Author Topic: Mark IV Big Block exhaust manifolds (Read 5547 times)

crossboss

Mark IV Big Block exhaust manifolds

firstgenaddict

Re: Mark IV Big Block exhaust manifolds

crossboss

Re: Mark IV Big Block exhaust manifolds

firstgenaddict

Re: Mark IV Big Block exhaust manifolds

crossboss

Re: Mark IV Big Block exhaust manifolds