Car is an animal when cold, no traction etc, then becomes extremely docile when hot (operating temp -190). I know I'm running rich cause when I disconnected the vacuum hose to the power booster idle shot way up instead of going down, plus the fumes I get at the tail pipe. I'm running a holley 3310 vacuum secondary carb all stock and its not the power valve cause i have that modification to prevent it from blowing out. How do i lean it out, I don't think I need to change jets as the jets are for full throttle right? I read somewhere that these carbs tend to warp and leak internally which make them run rich (car is always great after a fresh rebuild then a few days later is back to super rich). If I have to plane the card pieces to remove warpage can I do this with fine sandpaper on a piece of wood or do you recommend drilling hole through the butterfly thing (will this run my idle up to much?). Allen allioop108@aol.com
I'd say check and set the float level first then adjust the idle jets for highest vacuum. Also make sure your ignition is right. I'm not sure about the warpage issue. If you're talking about the metering blocks or the surface they mount to, I wouldn't worry about warpage there. The gaskets are thick enough to make up for some serious warpage.
What kind of engine vacuum do you have at idle with the engine hot? You may not have the correct sized power valve for the engine vacuum. The power valve blowout protection in the newer Holley carbs does help to prevent blowout of the PV, but it is not 100% foolproof. You still may have a faulty power valve. Another quick easy test is to let the engine warm up and run both mixture screws in until they seat gently. The engine should shut right off. If it does then the you know the carb is fine, the float level is good, power valve and size is correct, metering block gaskets are good etc... If the engine does not shut off then you are getting fuel from someplace else other than the idle circuit. :grin:
Not sure of vacuum, last time I checked it seemed a bit low but I will find the vac gage this weekend and hook it up and drive car around so I can see how readings are. One mixture screw will make engine shut off, the other does nothing. Will double check everything on my off time and report back. Allen
