Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Holley 850 CFM Vacuum Secondaries.. PITA..!!
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Old 04-11-2006, 07:39 PM
jtybt jtybt is offline
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I work on boats so this may not apply.

What power valve do you have(in/hg)? The higher the #, the earlier it will open. Normal street operation for economy would probably have a 5.5. Try a 6.5 to 7.5 or higher PV and lighter spring. Matching power valve to secondary opening should give you a kick in the pants.
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