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7769, RE: What is the stock engine vacuum supposed to be? 7psi, or 14psi of vacuum?
Posted by CarbonFiberRST, Dec-31-69 06:00 PM
the profec reads psi. the boost gauge reads in/hg, its different. but it seems that 1psi is approx. 2 in/hg. Notice that the area on the boost gauge dedicated to 0-30psi is 180* and the area dedicated to 0-30 in/hg is about 90*.
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