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Old 04-13-2008, 07:55 PM
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Jac Mac Jac Mac is offline
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Join Date: Feb 2006
Location: Gore. New Zealand., SI
Cobra Make, Engine: DIY Coupe, F/T ,MkIV.
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I think you will find your problem is the power valve, its a bit lean for your particular engine combination- this is one part in a carb that should be checked/changed to suit each individual engine combo- in this case being lean means you have to go up on the number to cure it- lets say you have a 6.5 now ( ie starts to open @ 6.5" vac ) , try a 7.5 so that it opens a little bit sooner. Holleys were jetted about 5% rich in the 'good old' days to cover most situations, now things are a bit different in this PC world & if 'you' happen to have a good combo with strong vac signal it will hold the PV shut longer & cause a lean condition. This can be real pain in cruise mode & you find yourself constantly having to slow down /speed up to avoid the stumble.

Jac Mac
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