Fuel in intake

[FED 387]

is the base plate or carb body warped???

[GallopinGhost]

might be on to something, base of carb body is warped .011", top of base plate is .002"


I think I'll find some socket head screws to replace the Phillips head ones.

Originally Posted by FED 387

is the base plate or carb body warped???

[GallopinGhost]

Well I made some progress. The screws are #12, so I didn't have any of those, so I tightened up the base plate best I could and ran it. The last few times I've run this engine,the vacuum floats from 8-12 in. with the rpm tracking the the vacuum, acted the same this time. Took off the carb and there was still fuel in the intake, maybe a little less. I took the carb base plate off and the base, body, and gasket were pretty much dry. Previously they were soaking wet. Far from a slam dunk, but it's worth pursuing. I think I will try to re-surface the body and get a new gasket.

[GallopinGhost]

Ok, I have finally found the real issue here. I did end up re-surfacing the bottom of the body and that is sealed up well. My original thought was to take out the power valve, I never tried that. So after looking at the baseplate, a lightbulb flickered on. First picture shows how I originally had it put together, second one is the fix.

[Bobby DiDomenico]

So changing from a 4 hole to a open plenum manifold gasket solved your issue?

[GallopinGhost]

It made a huge difference in the idle. from what I see, the first gasket blocked the source of manifold vacuum that feeds the PV. I think the PV was opening during idle. At least that is my new theory. Spark plugs are now dry as well.

[Greg Reimer 7376]

Make sure you have some sort of 4 hole gasket or something else, like a 4 hole thin spacer, to keep a base plate to bowl screw from getting loose and backing out and falling into the engine through the intake! Holleys do that.Could save you an engine.