New carb install?

wikdsvt

Club Member
I have a fresh 302 with headers, cam, intake.

I bought a holley 650 Dbl Pmpr, manual choke, mechanical secondaries new from Summit racing.

I installed the carb and want to know the correct way to make adjustments to get the car to idle correctly. I don't want to just start making adjustments and screw up the factory settings.

What its doing:
Not idling when cold, it stalls (it has a larger cam, not sure specs, came with car). i have to hit the gas to keep it from stalling every 10 seconds or so, when warm, the car idles fine.
when driving, and I come to a stop it stalls (usually) due to low rpms or feels like it is going to stall so I tap the gas to increase the RPM's.

when driving normal, there appears to be a little hesitation off idle when I floor it (not sure if carb related, might be ignition/timing issue).

So I know there is a screw that is attached to the linkage and will partially open the butterflies on the carb and move the linkage attached to the accelerator pedal a little and this will increase the idle rpms, but I'm not sure this is the "correct" way to do it. maybe it is? I don't know.

Like I previously said, I'm new to car engines, but not new to engines (small engines are no brainers, as are the carbs). get over 2 cylinders and I'm treading in unfamiliar territory.
 
I haven't touched a carb in many years. But, long ago I had one. Hook a vaccuum guage to the manifold. There should be idle fuel screws on the side of the primary metering block. With the engine cold get it to start and turn these screws out 1/8 of a turn at a time until you reach the highest manifold vaccuum you can then adjust the idle speed as needed. Hope this helps. I believe Holley has info on there site on how to do this.
 
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