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Old 12-17-2015, 09:31 AM   #18
dartman
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Default Re: Tips on filling Exhaust Crossover

Quote:
Originally Posted by Tom Goldman View Post
The cyl head section in the rule book reads ,"heat riser passage may be blocked from the intake manifold of the cylinder head .
Blocking the passage down in the valve pocket prohibited"
As long as the filler is recessed from the pocket ,it's legal.
You wont find a spec anywhere ,but I've seen Record holding heads that the filler is recessed about 3/8 of an inch.

does anybody have that in " notified of approval in writing from NHRA" on how far recessed it must be ? as stated in the section "how to use this RULEBOOK" on page XVII of the 2016 NHRA rulebook

just asking as my head guy will not fill them.
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