Holley Carb Experts Please Step In...
I'm trying to figure out how to tune my Holley 600cfm 4160 Carb. (Vacuum Secondaries, Electric Choke). A good friend of mine, let me borrow his $500 Wideband OČ Sensor, and I hooked it up to a custom made OČ Sensor bung on my exhaust (The sensor is heated, the bung is right behind the header collector), and it showed my tune was WAAAY off! I finally got the idle set @ 750rpm, with an A/F Ratio of 14.2:1. Then, when I did a WOT test, it showed, @ WOT (from 3000-5000rpm) it was at 11.5:1. Isn't that running a little rich? Shouldn't the A/F Ratio @ WOT be around 12.8:1?? My question is, how do I lean out the carb @ WOT? Do I need to adjust the float levels in the secondaries? Thanks guys!
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