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If you look at the information it says that a reading that is steady from 10-16" may be caused by a big cam. Low vacuum reading are an expected outcome of a big cam and I think it is the overlap that causes the low vacuum at low rpms.
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66 Chevy C30 Stakebody Dump, PS,PB, 327cu in
71 Corvette Coupe 454 4 speed
69 Chevy C20 Custom Camper
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