General Category > Quadrajet Carb Talk and Tips

Preferred thread size & type APT Access Plug?

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Cliff Ruggles:
3/8"-16 works fine, that's what we put in our fastener kits for the later APT models.

Edelbrock used fine 3/8" fine threads.....Cliff

AnotherMOPAR:
I used 3/8s 16 Allen as well on all the ones I've replaced. Anything alse and you gotta fiddle with the gasket/airhorn surface too much. IMO

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