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02-23-2021, 12:06 PM
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#5 |
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VIP Member
Join Date: Dec 2001
Location: Arkansas - In the middle of everything.
Posts: 2,002
Likes: 64
Liked 783 Times in 195 Posts
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Re: Super stock head porting
Porting for SS was first in the rulebooks in 1990. Port volumes were published and enforced way before that. When Chevrolet cast up the replacement 291 big block heads in 1987, the as-cast exhaust ports were bigger than the NHRA specs for the original production versions and several racers had problems with tech until NHRA changed their spec.
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