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Quote:
Originally Posted by 37fatfender
I'm confused the picture in Holleys installation instruction say the port in the metering block is "Timed spark vacuum source, Connects to Distributor advance system". That's were I have mine connected. I just read Richards download and will try it.
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The 390/8007 Holley was meant originally as a replacement carb. on early emissions systems cars. The "Timed spark vacuum source" was connected to one of two ports on the dual port distributor can. The can provided both vacuum advance and vacuum retard in an effort to control emissions.