Guys,

Anyone know what size jets they are running in a Holley 4bbl? I just got mine back from a complete rebuild and it is running too rich. I am going to remove the bowl later today and take the jets down in size, anyway. Just curious.

What size engine are you running? My car is really loading up on the right side. I'm thinking of doing the same thing. I'm running a 390 with a 600 cfm Holley. That's what they came with from the factory but, I've got a knew carb so, I think it needs to have smaller jets.
I've adjusted the floats - doesn't really help. Next move is to put in smaller jets.

Don :'(

My "J" Code has a 600 cfm Holley (not the original carburetor) and it is jetted with 60's on the primary side and 64's on the secondary side. I live in Flagstaff, AZ , at 7000 ft elevation, and the car runs very strong with no black smoke. I have the same jets in my Shelby GT 350 that has a dual feed Holley. Hope this helps, Russ

Russ,

Thanks for the info. I knew that someone in the community would know. I just pulled the primary and it has 66's in it. I think that I will take them down to 60's and see what happens. I will kepp you guys updated.