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Old 06-29-2008, 08:07 PM
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Holley Power Valve

A Holley Carb as 2 power valves? A primary & a secondary?

If on a cammed motor with but 8lbs of manifold vacuum, would the new 4.5 Power Valve be installed on the primary side?

When would the secondary-side Power valve be changed?

Sheesh!

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Old 06-29-2008, 08:32 PM
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How is the motor being used? Drive, drag, etc.
If you got that low a vacuum at idle, change both, would be my recommendation.
If its drag, block both power valves and jet up 10 numbers to start with.




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Originally Posted by DENCOUCH
A Holley Carb as 2 power valves? A primary & a secondary?

If on a cammed motor with but 8lbs of manifold vacuum, would the new 4.5 Power Valve be installed on the primary side?

When would the secondary-side Power valve be changed?

Sheesh!
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