When did the 426-4v Hemi & 427-4v HiRiser become legal?
I know these combos appear in the NHRA guides today:
426-4v Race Hemi Mopar
427-4v HiRiser Ford (1964)
But to my knowledge the combos never existed outside of NASCAR.
Were these combos NHRA legal in the 1964-1971 era, and did anybody run them? If so what were they factored at back then?
(Near as I can figure, the Race Hemi & 427HiRiser-8v were factored at 500hp, except the 427HiRiser-8v was factored down to 450hp for its final legal year of 1969).
Does anybody run the 4v combos today?
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