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Old 05-25-2023, 10:37 PM   #3
DeuceCoupe
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Default Re: When did the 426-4v Hemi & 427-4v HiRiser become legal?

Pretty good answer here, thread from 3 years ago.
Looks like maybe 15 years ago the Race Hemi 4v and 427 HiRiser 4v became NHRA legal.

But it appears back circa 1964-1971 it was all 8v.

http://classracer.com/classforum/sho...=38252&page=53
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