Thread: new boost gauge reading 20 lbs vaccum?
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Old 02-11-2008, 02:47 AM   #5
Def
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Vacuum gauge on most imperial unit gauges is in-Hg(inches of mercury), and yes, -20 in-Hg at idle is normal for stock cams. For more bumpy cams you can get anywhere from -10 to -15 in-Hg.
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