[regan wilson]

Last time I dynoed my motor we set mine at 10" . It's hard to pull too much vacuum unless you are using a 4 vane pump . I have been running the same three vane moroso pump for 8 years . I have a rebuild kit on the shelf . Guess I need to use it while I have mine down for a freshen up . The first pump I had was a Ford smog pump that I adapted to a vacuum pump . It just didnt pull enough . It was also ugly as hell .