Going through my stuff and I came across a BBC rear drain bolt type and the pan has a trap door type thingy with baffles... I have a couple of race pans with the same things... Did this come from GM as manufactured this way, or, was Bubba hard at work??? Real neat job of cutting away materiel on the pan bottom.. Can send 4 pics, but, I need an e-mail addy as my computer is a dynosaur... Bought a new Dell Inspiron with Windows Vista replete with Hi-speed, but, that is another tale of friggin' horror dealing with customer service people way way overseas.. Blasted 'puter has been outta service since Feb. and after spending close to a G note, they refuse to send a tech rep to fix the beastie... T.