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Vacuum pressure?

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03-09-2010, 03:17 PM	#1
Mccoleman830 Registered User Join Date: Aug 2009 Location: Sacramento, CA. Posts: 57	Vacuum pressure? I have a 78' K15 with Gm performance engine # 10067353. What should the vacuum pressure reading be at 800 rpm idle? Currently it reads at 15". Is this correct or should it be higher? Any help? Thanks.

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