I don't know but, swapping the rear main on a assembled Pontiac., I am not doing that. Almost none of them are daily drivers these days, fun toy cars. Its a lot of work pulling the pan on a engine in a car, let alone sealing it properly.
Heck, before I put a mid plate, elephant ears and multi piece headers I could pull my 455 in a hour- hour and a half. One time my oil pressure dropped to 10 lbs on a Saturday at the track. Put it on the trailer and took it home, pulled the engine, changed the pump, re installed the engine and raced it Sunday.
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