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Old 09-10-2008, 10:23 PM
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holley metering block won't adjust

I have a 4.3 v6 all stock 600cfm holley vacuum secondary
(just rebuild with new power valve and power valve saver) timing is set 4 degree's.
It act's like it has a blown power valve but I have changed it twice with a new one.I checked for vacuum leaks around intake and carb.I can turn the screws all the way in with no effect on the engine.Am I missing something?

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Old 09-11-2008, 05:35 AM
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could my floats be adjusted wrong?
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Old 09-11-2008, 05:54 AM
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Whats the fuel pressure? shine a light in the carbs throat while it`s running and see if you see any fuel coming out of the boosters, there should be none while it`s idling. Does white smoke come out of the carb after it`s shut down? this indicates it`s flooding out of the idle circuits.
Any of these issues makes the carb unresponsive. The problem is either fuel pressure too high, floats set too high, or needle stuck open in the seat.
Carbs usually don`t like fuel pressure over 6 psi.
After I got the carb back on track I would raise the initial timing, this will help with the idle.
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