Re: Holley carb. gurus needed!
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Originally Posted by Rev
Remember that it's when the manifold vacuum is below the rating that the power valve is open. At WOT, the vacuum is right at 0 or a hair more. No matter what pwer valve # you use, it will always be open at WOT.
Rev
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Not exactly true. Manifold vacuum WILL raise as rpms increase. I DID read that in my Holley book....LOL
According to the book, you're supposed to find a PV rating that will remain closed at idle yet high enough to stay open during acceleration periods(drag racing)
My Holley is a 750dp(4150).
Only a vacuum gauge will tell you exactly what PV you really need without the "guess" work.
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'82 GT 351W (.060)Comp Cams 274* Extreme Energy cam, ported & polished heads w/ 1.94/1.60 valves 10.3:1 flat top pistons,stealth intake, Mallory dizzy,Holley 750dp carb, BBK shorties,Flowmaster exhaust,C-4 with 3700 stall converter, B&M pro shifter,8.8 rear, 4:10's, subframes, electric fan, powermaster alternator, 4 core radiator.
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