Dominic was the same part number. In fact my freind ended up trying a one piece steel 440 Source valley pan on his motor with the B1-BS M.W. ported heads and he stil had problems getting it to seal up with the Right Stuff The thicker cast and billet aluminum valley covers don't seem to have that problems as much
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Dominic was the same part number. In fact my freind ended up trying a one piece steel 440 Source valley pan on his motor with the B1-BS M.W. ported heads and he stil had problems getting it to seal up with the Right Stuff 
The thicker cast and billet aluminum valley covers don't seem to have that problems as much 
