General Category > Quadrajet Carb Talk and Tips

Idle air bypass

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Cliff Ruggles:
If the 327 has a small cam, and good vacuum at idle with "normal" spark advance, there is no need to give it any more advance at idle speed.  We very seldom use manifold vacuum to the advance for engines tuned here.  This assumes the cam is well chosen for the compression and CID......Cliff

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