Re: Blower Question
If it is a boost referenced p/v then there will be a hose or tubing connecting the carburetor to the intake manifold. Without that connection the carb cannot see boost and the subsequent loss of vacuum in the intake. I have two 600 Holleys on a 6-71, not boost referenced and my blower is kinda loose and I run 15% underdrive. With a vacuum gauge connected to the carb adapter it always pulls vacuum, but on the other hand the vac/boost gauge connected to the manifold shows vacuum with part throttle operation but when you give it some throttle it quickly goes to boost. My particular combination is fine not boost referenced, but your results may vary.
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