Holley carb question

Steve in Denver

Steve in Denver

Well-known member
Hi all, So I have wondered over here from the flathead side. Maybe some of you can help me. I have a '36 5 window with a 49-53 flathead. Because I wanted a carb with a hand throttle attachment, I got a carb for a 54 pick-up from Dennis Carpenter. Well, it is dumping way too much gas in the carb.


Sounds ok when cold but when it gets hot, it dies. I put the throttle all the way to the floor and it finally starts. Then it is good til the next stop light or two, then its dead again. I will check the jets when I take it apart tomorrow, but what level should the float be set at? Oh, I'm in Denver, so not as much air up here.
Steve
 
Sounds like a defective carb! Is it still under warranty? From the symptoms, jets will not fix it. Having to floor the throttle is a sure sign that it is flooding over, either from the float setting too high, a bad float (gas leaking into it), dirt in the needle and seat, or blown power valve. Some internet research should turn up how to set the float, or try your library.
 
The carbs for Y-blocks likely have larger main jet sizes. The venturis are also larger for the most part. There are also some small internal differences between the aftermarket Holley 2100 and the Ford version in the way the accelerator pump system is set up.

As was already mentioned, power valves can blow out or not be sealing correctly and can cause internal fuel leaks. I don't know who DC has overhauling carbs for him or if they do it in house but folks that know these carbs are aware of the poor fit of the late type power valves in the early carbs. Also keep in mind that heat related problems can show up with the ignition system. Coincidences can happen but follow the carb up until it is certain that it's without discrepancies since it is the latest item and seems to be problematic when it wasn't before.
 
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