Originally Posted By jbc426
Don't those manifolds defeat the purpose of using an aftermarket aluminum head.


I don’t think the problem is necessarily “aftermarket aluminum heads” and ex manifolds, but I don’t think larger runner volumes along with ex manifolds are going to be the hot ticket.

The 84cc E street heads have straight plugs(no manifold issues), and the smaller runners are probably going to be better 90% of the time.

68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads