Re: Hi from TN, I have a question...
I have an Competition Cam part#12-212-2 series 280H lift.480/.480. The vacuum problem is causing the engine to run very rich. Or that what I believe it to be. I have had two different carbs one a 600 Eldenbrock and just recently a 600 Holley. Both were doing the same thing, burning rich fuel and if I put my hands to exhaust its moist.
Sarter fluid around the carb base and manifold paying attention to the front and rear. If the engine has been adjusted to compensate for the leak, the motor will bog. If it wasn't adjusted for the leak, then the motor should rev up a bit. At which ever spot that one of these two results happends is your trouble spot. Snug up the bolts in the area you find and then retest and/or put the vacuum gauge back on and see what the reading is.
Do you recall the lift of the cam per chance. This could also be the reason for the lower hg your experiencing. A fairly high lift of about .470 is enough to drop the hg to the 10-13 range. If that's the case then there isn't much you can do about it.[/QUOTE]
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