Stop in for a cup of coffee
So after being left on the roadside in the Demon on Sunday fiasco...I changed to a 750 Holley vacuum secondary carb from my son's rat rod for the short term. It ran pretty well, didn't die at all but still has quite a stumble under load off idle. Seems like an accelerator pump issue/adjustment/cc issue. Bogged when attempting a burn out and a stumble if just idling and a sharp wide open throttle stab. It made the whole trip that it didn't make on Sunday and transision driving down the road was really good. I can't believe how hot the hood and fender tops get from the fenderwell headers. Almost too hot to touch. There is no insulation on the hood but maybe there should be? As for the fenders, with no inner fenders, I thought there would be enough air flow to keep them cool but no way. Header wrap or ???? thoughts??
Get the off idle worked out first.
First find out how much transfer slot is showing at hot idle. That will be clue number one.
If its out of range, then adjust timing or whatever is needed. Obviously not going to drill holes in a borrowed carb.
Holley/Demon Carb stumble
Once everything is hot, get in the garage or shade and under the hood.
Manually open the throttles very slowly. If there's a hesitation then its in the idle circuit.
Take it for a drive and very slowly open the throttle from a dead stop. Same deal, any hesitation or flatness and its the idle circuit.
Simplest reversible test is stick some wires into each of the primary air bleeds. IIRC 3310-3 had .076" primary air bleeds. Stick a wire in each with enough diameter to reduce the area to the equivalent of .073"
Yes some math required. LOL
if you don;t have piano wire or such, strip some stranded lectrical wires.
In any case, stick it in the air bleed, run it up over the choke horn and down under the air cleaner gasket.