Quote:
Originally Posted by SSDiv6
NHRA will only approve cylinder heads available to the public.
The RHS/ProAction cast iron cylinder heads were discountinued many years ago.
How I know? I tried to get the RHS Ford cast iron head in the approved list and was rejected twice because they are were discontinued.
There are still some virgin SBC 14 degree heads out there, however, due to their demand in the Comp Eliminator Jr. Fuel classes, they are a big commodity.
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That was my observation also. Although I feel that NHRA makes exceptions on the "available to the public" premise. Some of the "accepted" aftermarket heads on the list are only available if you know somebody.