General Category > Quadrajet Carb Talk and Tips

erratic vacuum???

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Jeffs68:
I prefer to use manifold vacuum for dist. advance.

Sorting out the idle vacuum issue should also help keep the brake booster working properly.

jbh7052:
but doesn't the manifold vacuum pull the advance in at idle? Anyway I set the timing and I still have the vacuum gauge flurrying between 15in and 17in. this is the first small block chevy that I have built that likes above 12 deg of initial advance. I am sitting at 17 deg right now. this is where it runs its best. Also I noticed that with the initial timing at 12 deg I had to turn the idle up and this pulled vacuum through the ported slot for the advance on the distributor. starting to think that maybe the timing marks are not correct. I had to buy an aftermarket bolt on marker with timing marks. lost the original cover that was on the engine over the years

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