its the same cam thats in the GM ZZ383 .... the heads arent anything special... shaved 85 heads. other than that, stock specs. exhaust is stock exhaust manifolds then 3 in the rest of the way back with a flowmaster super 40 muffler. should i spend the extra bucks and get some new heads? and i hear that air gap intake manifold is pretty generic?? not much better than stock... is this true? thanks for the guesses, i appreciate it! keep em coming!