Cliff's Quadrajet Parts and Rebuild Kits

General Category => Quadrajet Carb Talk and Tips => Topic started by: mcx on October 15, 2023, 10:15:39 AM

Title: Baseplate APT screw
Post by: mcx on October 15, 2023, 10:15:39 AM

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.

Title: Re: Baseplate APT screw
Post by: Cliff Ruggles on October 16, 2023, 04:13:26 AM

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