How much adjuster preload length are you using?
Real unusual to need to different length pushrods on a street motor with standard port 440 type heads, common on the heads that need offset rocker arms on the intake valves like the Indy 440-1 and Eddy Victors: scope:

Last edited by Cab_Burge; 02/11/23 10:48 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)