On my B1 540 wet sump and Moroso Enhanced 4 vane setup I was pulling 15-17” and keeping a close eye on it. With my 412” Canted Valve head SBF, 4 stage dry sump and Moroso 4 vane I was pulling 21-23”. Not every application needs a vac pump, but all applications will benefit at making more HP, especially when setup for vac pump use.

Greg, like Al suggested, freshen up your pump, it’s probably time.