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Old 06-25-2011, 09:53 PM
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350 SBC w/Holley, won't idle

Hey guys,
Need more help. I have a SBC 350 and am using a Holley 650 double pumper with a shaved choke horn. I'm having a really hard time getting it to idle. It runs very well when it's up a few RPM's but doesn't like to come down and idle. I'm running a victor jr. intake, Brodix IK200 aluminum heads, comp 298H cam and a turbo 350 tranny with a B&M 3000-3200 stall.

Any ideas? Thanks.

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Old 06-26-2011, 01:39 AM
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Whats "up a few rpms"...where does it idle comfortably? Also, with that parts combo ( BIG cam) and no choke it probably won't want to idle below 800 or so.
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Old 06-26-2011, 03:00 AM
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Where is your timing set?

Is the carb dripping fuel from the venturi at idle?(Float leven too high.)

Whats your vacuum at idle? What size power valves are in the carb?
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Old 06-26-2011, 08:57 AM
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Clairify what cam you got in this motor.

A long duration cam EG: comp 292H magnum will need the distributor recurved to idle correctly.

If the cam is this big or bigger (244@.050) simply lock out the mechanical advance curve and reset the locked timing at 36dg BTDC.

Remove the carb. flip it over and reset the pri and sec throttle blade opening/idle fuel transfer slot exposure about .020-.030". Install a 4.5" rated power valve and reinstall the carb.

Now it will idle . The "Big Mutha' Thumpr cam" needs a 3500-4000 stall 9"-10" converter to work best.

Last edited by F-BIRD'88; 06-26-2011 at 09:10 AM.
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Old 06-27-2011, 11:48 AM
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Okay...here's what I can answer.

- Timing is set at 36*BTDC with a 4.5 power valve

- I have disabled the mechanical advance on the distributor

- Don't see that I am getting any drips out of the venturi's

- I will try the blade gapping (how do you measure to
.020-.030?)

- What concerns me is that I put my friends Street Demon (750, manual secs) on and it seemed to run better. I would prefer to run the Holley. Should I be running a carb with a choke?


Thanks for all the info, really appreciate it.
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