can anyone please help! I have a 1967 gto with the 400 ys block motor it has the his / hers auto trans. My question is concerning the cylinder heads, the number cast on the side is 670, how do these factory originals stack up to aftermarket units like edelbrocks. Any help would be greatly appreciated. THANX!!!by Dan Frattaroli - Pontiac GTO Forum
Hey guys, i'm wondering if you can give me some info. I recently bought a 67 GTO hardtop, it is in good shape and all original. I plan on restoring it in the spring and summer of 2003. my question is this, concerning the 400 ys motor, specifically the cylinder heads, the number cast into the heads is 670. How do these particular factory heads stack up against the others. Any info would be apby Dan Frattaroli - Pontiac GTO Forum