Reply to "How much vacuum should my Pantera's engine have at idle?"

No real answer except a dyno test with a concurrent tuneup. Your combination certainly needs a power valve a number or so below the vacuum gauge reading, or it will always run rich (more so than one would expect running a race cam on the street). Power brakes suffer from such combinations, enough that there are electric vacuum pump systems sold to restore safe braking on the street.

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