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
Note to self: don't try to save a few bucks on lower priced part's,,guess I just added one more item to the swap meet pile.lol
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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 
