Need help, I am having a problem finding a fel pro permatorque head gasket for a 4.030 bore. The closest one I found is 4.166 which is too big. Now anybody know if fel pro makes one this size and any of you guys using copper head gaskets? If so do they seal the water good?

 

Don't use copper ones in a street motor. They won't withstand many heat-cool cycles before they fail.

Don't worry about the bore diameter, it's just fine. Doesn't hurt a thing. That's why you can't find one with a smaller bore: it isn't necessary. Use the 1010 or 1014 Fel-Pro.