Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Power valves. Some say half your manifold vacuum, some say 2 hg below. Who is right?
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Old 11-20-2012, 04:41 PM
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idle vacuum doesn't have a damn thing to do with PV selection. Drive your car on the highway at your normal cruising speed on a level road, what is your vacuum at that moment? Now subtract 3 or 4 and you'll have a good number to start with. Going smaller will slightly help mpg's going higher will slightly help power.
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