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Re: Oil pan gasket replacement for 1972 GMC 402 engine
In lieu of using a engine hoist, you can use a floor jack with a flat block of wood under pan to lift motor up after doing pre hoist procedures Rusty notes. Then use pieces of 2x4 blocks between MM and stands to let motor sit on those. Motor wants to be about 4" higher so pan clears X member. I also remove dust/inspection pan for clutch/TC.
Pull pan off/out from rear. Confirm rails are flat before install. May need to use 1/4" thick bar stock & hammer to flatten out around pan bolt holes if they are deformed. I prefer the FelPro 1 piece pan gaskets. Use Permatex Black Utra on curved ends and where they meet flat part of pan front & rear
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