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Blown power valve? |
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Gary S 
Grand Poobah 
Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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 Posted: September-28-2021 at 6:46pm |
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What year? 1992 Holley started installing power valve backfire check valves. They make a kit to add one if you have an earlier one
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uncle-buck
Senior Member 
Joined: June-14-2004 Location: United States Status: Offline Points: 337 |
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Posted: September-28-2021 at 5:52pm |
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Took the boat out on Sunday and had several backfires. Later discovered (with Jonny Quest's generous assistance) that I had over-tightened the rotor screws on my new D.U.I. distributor - so it was not advancing. Now fixed, but am wondering if the power valve in the Holley carb is blown. Ran the engine this afternoon and closed both mixture screws all the way. The engine stumbled, but continued to run. That means the power valve is toast, doesn't it?
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