how much vacuum is your engine pulling?
higher than 13??
most of the caution on low vacuum is around 8-12.
but, i hear guys can run with 10.5-12.5 most times; but i don't know how often they stop.
hydro-boost systems work great on many vehicles also..
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68 Malibu, 427, T400, 3.73 12bolt, F1-R procharged & intercooled
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