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I have a newly rebuilt 1725 with stock cam - I'm getting 16" at 1000 rpm. If it should be 20" - 22", what else could cause lower vacuum?
Thanks for the input guys. Timing is 15 - 18 degrees, which is at the upper end of recommended. No PCV - I'm just running a road tube. Valves just re-adjusted "very hot" prior to checking. Brand new Weber carb from SS. New rings not yet seated properly - maybe. I have about 400 miles of pretty moderate driving on it.
Intake manifold leak would definitely do it, but I have been over that thing with a fine tooth comb. Removed it, carefully inspected it, made sure the mounting surface was flat and true. No gaps when mounted. Got a good tip from a mechanic friend to put a piece of rubber hose on a propane torch and use the raw propane, which can be carefully directed, to check for leaks. No leaks found.