can any of you 454 owners tell me what manifold vac you read at idle .. I have been told that mine is low .. it reads 15-17" at idle and engine warm .. I have done everything to find this so called "vac leak" but none to be found ... engine runs fine .... stock motor (LS5 .. 1971)No leaks into the cooling system .. verified by pressure check .. ALL vac line removed and plugged no change in reading .. nothing found at base of carb ... so I am at a loss ..
LS5 manifold vac.
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