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Old 08-19-2017, 09:56 PM   #70
HP HUNTER
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Join Date: Feb 2012
Location: Colorado Springs Colorado/Thousand Oaks Ca
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Default Re: 1971 Buick 455 GS F/SA G/SA Build

Quote:
Originally Posted by Steve Lackey View Post
Have you tried any header tuning while on the dyno? These engines really benefit from the exhaust scavenging. That is why the original Stage 2 heads were so effective.
I tried different lengths of extensions, the best were in the pictures. Merge collectors were not tested.
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