Quote:
Originally Posted by SSDiv6
I know for a fact that NHRA does not have all the cylinder head volume specs from virgin heads. As a matter of fact, many of the volumes in the SS list are from cylinder heads that were already ported when they did not even have a spec available for a stock virgin head and when it was still illegal to port heads in SS. By the way, at one time, I used to be an SFI NHRA Tech. Terry Bell who goes under the X-Tech-Man in this forum also knows about this issue and has made very valid points on this issue before.
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I would agree that they do not have them all, but they have the popular ones. And I would agree that some were drawn on, at that time, bogus heads.
So, by your own admission, SS spec's (for the most part) are to big to use for a stock head---Correct?
So when a 283 head pours 10% more than the SS spec, how do you defend that? How can you justify that big of a runner? Surely, you don't expect me to buy into the new valve rule as being the cause?