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scicala · 04-10-2019, 03:36 PM

That's news to me. I've been doing all USA carburetors since I was 17 and never ran into two different main jet thread sizes on Holley carbs. They did change the numbering on the jets with 3 digits instead of two when the emission years started. I'm pretty sure that represented 100% jet flowing before carb assembly.
The guy at the carb shop may have been referring to Autolite/Motorcraft jet thread size (which is larger).

Sal

04-10-2019, 03:36 PM	#40
scicala Senior Member Join Date: Jun 2010 Location: Detroit suburb, MI Posts: 3,706	Re: 3duce set up Ford 94 carburetors That's news to me. I've been doing all USA carburetors since I was 17 and never ran into two different main jet thread sizes on Holley carbs. They did change the numbering on the jets with 3 digits instead of two when the emission years started. I'm pretty sure that represented 100% jet flowing before carb assembly. The guy at the carb shop may have been referring to Autolite/Motorcraft jet thread size (which is larger). Sal