Hei conversion Intermittent start?

magnumdust said

So i got everything cleaned up and as far as i can tell its working great(been too busy to get any sort of a road test on it)

Did run into one issue that's stumped me. My vac. advance causes the idle to go nuts when its hooked up. Looked online and it say the airgap was set wrong, which doesnt make sense given that i've set it myself. Its not a huge issue since the vac. advance will be unneccary anyways once i get the spark control setup on my efi kit(next step)

Pics of the mostly finished setup, little odds/ends need to be finished like my tach. wire and cleanly route the plug wires.

Click to expand...

Remove the cap from the distributor. Rotate the engine so that the rotor is just before the pickup metal extension that is incased in plastic. Remove the vacuum advance hose from the carb. Either create the vacuum with your mouth, or use a vacuum tool.

I'll bet the vacuum advance, when it rotates, is moving the pickup coil assembly closer to the rotor. This seems to be common on rebuilt or even new distributors, and is a notorious week link in the Mopar distributor.

The upper plate that the vacuum rod attaches to rotates in response to the vacuum signal. It is also what the pickup coil assembly is mounted to. Either the pivot point hole in the plate is not drilled correct or is too big, or the bend in the plate that supports the pickup is not a 90 degree bend, or both.