I have purchased a set of corvette 113 heads. I've been slowling buying the gaskets needed to install them. I'm down to the head gaskets. At one point I noticed online it said one gasket was for steel heads, one was for alumns. Now it doesnt seem to show that online, or in the stores pcs.

Can someone tell me which felpro gasket I need? Or what you used with Alumn heads?

felpro 501sd
felpro 7733pt