Quote:
Originally posted by SuperHart
RE: Power Valves - help me out here. My vacuum gauge reads 17-18 at idle. The power valves are 6.5s. Should I swap for different valves or leave well enough alone?
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On a street engine, idle vacuum is often much higher than steady throttle cruise vacuum, for this reason idle vacuum should not be used to determine the correct power valve. To select the correct PV, check vacuum at various steady throttle cruise speeds.
Using idle vacuum is the correct way to select the PV for race engines since they don't experience steady throttle cruise.
Scott