Good to know, I think my block is iron if I'm not mistaken. The head and valve cover is my primary concern really. My intake and exhaust manifolds are both polished T606 Stainless Steel (Magnus and Megan Racing respectively) along with the spark plug cover on the valve cover...it's JM Fab polished aluminum. as well as JM Fab oil catch can, coil bracket, radiator overflow tank, and the radiator is blackworks aluminum...that's why I'm trying to get the old crappy stock look off the other stuff lol