questions about head gaskets. my motor is a .060" over small block chevy which would be a 4.060" bore correct? so the head gaskets that my buddy used at the machine shop last go around are felpro 7733PT2 http://www.summitracing.com/parts/fel-7733pt2/overview/ these claim to be for a 4.125 in bore. how does this make sense? also are these gaskets good for my aluminum heads?