Quote:
Originally Posted by ceej
The reason you will end up in the power valve is to keep the mixture from going too lean. In order to cover moderate acceleration, the power valve adds enrichment. Like when you encounter a hill, or decide to travel at 50 instead of 40 mph. Part of the enrichment is the pump shot, the other would be the power valve.
In order to cover moderate, or even heavy acceleration, the power valve must open up to provide acceleration mixture, which is necessarily richer than cruise. To do that with the jets, your economy would tank across the board.
CJ
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Isn't the only time the power valve opens on a Holley is when the vacuum drops lower than the power valve's rating,as in accelerating,and even then ,you can lean out the pv channel restrictions if it spews out too much fuel. You can adjust the main jets and the power valve with a wide-band meter and a vac. gauge.