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Old 09-13-2012, 11:30 AM
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demon carb stumble @wot

i got a 355 sbc foot brake car i put a 750 mighty demon on it im having a dead spot @wot then it picks up an does fine ive tried the slot transfer seems if i close it up where it needs to be it idles at very low rpm also the air fuel mix screws if you turn them all way it seems to idle up the motor

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Old 09-13-2012, 01:55 PM
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Disconnect the vacuum advance and bring the timing more advance another 10*. Adjust the idle down. Reconnect the vacuum line. The idle should increase when you advance the timing. Try to adjust A/F screws.
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Old 09-13-2012, 02:07 PM
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Im not running a vac advance got it plugged off you think i should hook it back up
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Old 09-13-2012, 02:18 PM
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What is timing set at?
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Old 09-13-2012, 02:25 PM
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Im not sure ive tried it at dif spots it stumbles even in park a little but its worse when i leave out the hole
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Old 09-13-2012, 02:34 PM
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last it was checked using a light it was @26 deg
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Old 09-13-2012, 03:52 PM
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demon carb stumble @ wot

Be sure to check all ignition components carefully. Distributor cap, rotor, correct spark plugs gaped at .035, make sure spark plug wires are not touching headers. Timing set at 24* BTDC. Check valve lash again. Here is the manual for the Mighty Demon. It shows how to tune your Demon carburetor. http://www.demoncarbs.com/Assets/doc.../LIT705rev.pdf. You will need a vacuum gauge and a timing light with advance. Here is another article on how to set up your distributor. http://www.crankshaftcoalition.com/w...EI_distributor
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