Never used them but from what I've heard the 302's are prone to cracking..the 974's are smog heads and useless i got a set rusting in the garage probably worth more scrap metal..
I have said it before, and i will say it again.
Send them my way! I will take those P.O.S. "974" of your hands!(and make them flow every bit as good as a Stock 340/X head)
Every thing but the valve seat area is the same........WOOPS,:angry7: I'm trying to get YOU to give them to me............yeah there door stops GIVE THEM TO ME!:toothy10: