When I built my 301-383 stroker engine and used a number 15 head the 301 gasket did not match properly with the non 301 head.I ended up with the Butler 400 gasket as it matched the combustion chamber best.It was marginal on the 301 block but was close enough to work.The felpros are generic to work with either valve angle of the Pontiac heads and did not work.Tom
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