General Category > Quadrajet Carb Talk and Tips

Baseplate APT screw

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mcx:
I’m overhauling a 72 Olds 7042250, I have removed the baseplate APT screw and once again noticed it has a much larger thread than the usual APT 10-32 thread? I have seen this a few times now and was wondering if GM used different types? These carbs still had the tamper-proof cap. Any info appreciated.

Cliff Ruggles:
It's rare but once in a while they will be a larger thread, pretty sure it's 1/4" no #10......

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