My buddy fairly recently bought a chassis dyno and finally blew the dust and cobwebs off my junk... found 40hp on the motor (was way lean) and found over 100hp on the bottle (was way fat) anyways my 496" street motor with a solid flat tappet cam, flat top pistons and out of the box edelbrocks made 517 hp to the tires on motor and 837 hp on the unit... still have some tuning in it too!!! Not bad huh?