Not necessary on any engine, and simply makes life a little easier by keeping the gasket located correctly on the pan when setting it in place. I usually Gasgacinch the gasket to the block (just an old habit) and therefore never use the included plastic alignment tabs.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 Catalina Safari Wagon.
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