Question...should there be a difference in hyd roller pre load on Iron vs Aluminum heads?
My Lunati cam paper work reads 1/2 turn after zero lash. With my iron 049's I'm a heavy 1/2 turn. But no mention of iron vs aluminum heads.
Also... a friends builder suggest 1/16'th of pre load on his Comp hyd rollers. Maybe he feels this is to guard against lifter pump-up >his engine revs to 6K.
I always thought... 1/4 turn was the minimum. He says his engine is very noisy clickty-clack