Are the "1965 "K" Hemi aluminum heads" the only ones NHRA allows on 65 Stock and Super Stock cars or is there a aftermarket replacement allowed?
For the 1964 Hemi engines, NHRA lists this:
A -2468016 OEM CI Head uses S/SS Factors
A -2780559,2780559-M,2780559-M1,2780559-M2 CI Heads use S/SS Factors
A -2531110,2531110-M,2531110-M2,3614433 AL Heads use S/SS factor with replacement heads
For the 1965:
A -2531110 OEM AL Head uses S/SS Factors
A -2780559,2780559-M,2780559-M1,2780559-M2 CI Heads use S/SS Factors
A -2531110-M,2531110-M2,3614433 AL Heads use S/SS factor
The 433 heads are legal with one plug blocked in each cylinder since it was a dual plug head.
