[decooney]

Hey Carb/FE guys out there,


I know this is a general question, but I want to get some idea as to what some of you arrived at for your final jetting on single Holley HP (4150) carbs for your FEs. I run a 428CJ, 10.8:1 compression, with a fairly large cam.

Currently, my HP/4150 830cfm double-pumper with downleg boosters is running 86/86 jets squared. This seems pretty large for street driving. For WOT or on a track, its tolerable, but when getting stuck at a stoplight or two, it starts to load up. It requires a quick clear out, and its good til I get caught at a light again.

I am trying to decide if I need to keep the jetting squared, just going down a few jet sizes for primary/secondary from 86/86 to to something like 82/82, or if I can just step down on the primary. I'm not as familiar with the restrictions on an HP series carb vs. the normal street Holleys. I noticed the normal street Holley 830 runs 80/80 jets.

Any thoughts on possible combinations or step-down limit restrictions?.