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Well Ive figured it out! Mderoy340 I think nailed it. The manifold vacuum sorce is basically below the transition slot on the mighty demon carbs! Took the ol girl out for a drive. Run loke a scalded cat. Came home pulled vacuum line off distributor & dry. Then pulled vacuum cap off carburetor...

I have zero hood clearance for a spacer. Im hoping relocating vacuum sorce to the intake runner will cure it. Mine isb a 750 mighty demon so that could make sense then.

Anyone who runs there car on the street & can pull enough vacuum to properly work a vacuum advance canister is missing out on easyer starting (lower base/initial timing) soon as engine fires vacuum adds timing at idle & low power conditions. And it picks up mileage believe it or not. Its also...

Its on a 110 lsa. About middle of the road for lsa. Im hoping moving to the intake runner & vertical will help.

Its on the manifold vacuum port not the timed port. The timed port was developed for emissions purpose only. Carb settings are rite on. So farvno problom now since switching to intake runner for vacuum sorce.

Its a street car & runs noticeably better cruising & runs cooler with a combined 47-50º timing at light throttle. Added benefit is its better on fuel for what its worth. Also ttying to start it hot @ a locked 35º would be a joke.

[QUOT="dart_68, post: 1971788089, member: 50493"]That's strange. The only way I can think that fuel would travel from the carb fitting too the vac diaphragm is that fuel is being pushed out the fitting instead of applying a vacuum. I can't even see a surging problem causing that but I guess...

Just as the title says im getting fuel in my vacuum advance canister. Its ruining the diaphragm in it then leaking. Im dam Lucky it didn't blow up the distributor or cap! Its hooked to manifold vacuum sorce on the 750 race demon carburetor. The motor is a very healthy 340 with a 242 247 @ 050...

Really? !?!? SWEET! Thanks man! Yers was a factory dual point prestolite too correct?

Any one know if the pertronix 71385 will work in the factory hi-po 273 prestolite distributor? I know the 1385 igniter works just fine. Would like the rev limiter feature of the igniter III if it will work. Thanks