Upgrading factory Holley?

[306]

Working on an 83 Mustang GT here with the factory Holley four barrel.

I noticed it doesn't have idle mixture screws in the conventional location (on each side of the primary metering block).

I was wondering if a metering block from a standard universal 600cfm Holley can be slipped into place as a direct replacement for the stock one without other carb mods?



Thanks for any input you may have!

 

[PuterAmI]

No, it cannot.

The idle mixture is in the baseplate for the 4180C. They are reverse of a "regular" 4160 in that you screw out to lean. If not done already, you need to drill out the caps that cover the screws.

 

[306]

Thanks...the carb suddenly has no idle circuit...runs great at 2000rpm or more, but won't run at all under that. The car is a major terd that sits for months and years and then is expected to run like a new car...and I always get the job of trying to patch it up!

I'm gonna recommend a new Edelbrock 500cfm carb!