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Old 07-17-2008, 09:05 PM
fatblock fatblock is offline
8-71 blown 461 Rat on E85
 
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That is the correct way to boost referance your power valves.the pv,s need to respond to engine load not the constant vacuum they see atop a roots blower.it is not unusual to see vacuum under the carbs with boost in the manifold.The carbs are a passive device and respond only when yanked on.Bigger blowers can and will pull more air thru a carb then its fuel delivery was designed for.This may help you understand why supercharger carbs for the street require different ckts and metering vs a n/a setup.
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