ProComp/Speedmaster aluminum heads

Promax shockers come with 2.08 intake valve out of the box....yes...they will out flow the SM head....
Promax valve springs limit valve lift to .600.....not enough....need to change valve springs...
Bare head cost is 1647.00 plus shipping....

I will wait and see how the hand ported ones come back with 2.055 intake from IMM....