Reply to "351C typical vacuum readings"

noquarterMember

quote:
this increases to about 14 when throttle is blipped

Are you sure you get manifold vacuum and not ported vacuum? Maybe partly shrouded ported vacuum? To make sure, maybe source the vacuum for the gauge from the manifold not the carb?

Despite that, 10 is a bit low. But if e.g. your timing is off, that can do it. The whole process is in my book (sorry), I'll be happy to send you the relevant paragraphs, where you adjusst the ignition and the carb to obtain "highest steady vacuum". Maybe 10 is max you can get, often a proper tune and a nice 4 corner idle can give you higher vacuum. A totally stock engine up to 20, performance engine often 12-15

2/16/182:08 AM

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