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SSDiv6 · 02-20-2019, 05:58 PM

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.

There are still a large number of Ford N351 castings available because they have been banned from many circle track classes. As a matter of fact, I have two pairs of new N351 heads on the shelf and one set of fully ported bare heads also.

02-20-2019, 05:58 PM	#27
SSDiv6 VIP Member Join Date: Feb 2003 Location: Glendale, Arizona Posts: 2,991 Likes: 693 Liked 1,457 Times in 543 Posts	Re: Legal Heads for SS/modified 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. There are still a large number of Ford N351 castings available because they have been banned from many circle track classes. As a matter of fact, I have two pairs of new N351 heads on the shelf and one set of fully ported bare heads also.