Aftermarket/Replacement Cylinder Head Rule Change

[PJ305]

Originally Posted by ron mattson

No worries guys I'm quite sure there will be
Another aluminum head out soon with smaller
runners 165 ish and possibly another brand
of aluminum head, I would not get so worked up
until the dust settles 30-60 days.

Has anyone contacted NHRA and have them explain how the SBC heads they approved are going to maintain the same runner volumes as the stock head they replace!