Quote:
Originally Posted by Steve W
... increases the intake vacuum enough to suck oil past marginal valve guides that previously was just borderline. The solution besides rebuilding the top end may be to reduce the oil level in the motor, lower the idle speed and/or backdate the idle specs.
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Steve,
That makes perfect sense if the intake guides were marginal. If that were so, then wouldn't there be a significant amount of smoke on engine overrun when intake vacuum is even higher?
Cheers,
Joe