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bill6368 09-13-2012 11:30 AM

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 :confused::confused::confused:

lg1969 09-13-2012 01:55 PM

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.

bill6368 09-13-2012 02:07 PM

Im not running a vac advance got it plugged off you think i should hook it back up

lg1969 09-13-2012 02:18 PM

What is timing set at?

bill6368 09-13-2012 02:25 PM

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

bill6368 09-13-2012 02:34 PM

last it was checked using a light it was @26 deg

cdminter59 09-13-2012 03:52 PM

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. You will need a vacuum gauge and a timing light with advance. Here is another article on how to set up your distributor.

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