Comp XE-284-H Cam, 1-3/4 Long Tube headers, into 3 inch exhaust with Flowmaster Mufflers, No Cats. BUT I think several things contribute to it's sound beyond that... 1) 351W Bored .30 over 2) Compression 11/1 Compression pistons 3) Aluminum Heads with 220/190 Valves