I raced a 1963 Plymouth 415 HP Max Wedge Belvedere in NHRA Stock in Division 7 and at many national events from 1974 to 1988 with no air cleaners and later with just the bases of the air cleaner (that made it run .02 o .040 quicker) with no issues in tech or racing it shruggy
Many internet myths out here down
OP, are you thinking of one of the other sanctioning organizations?

Last edited by Cab_Burge; 12/12/21 02:23 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)