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Username Post: Vacuum Advance- how is it supposed to work?
Forum Newbie
Posts: 24

Loc: Bear Creek NC 27207
Reg: 11-26-10
01-11-15 07:28 PM - Post#2513947    
    In response to Mr. Sinister

I want to tank you for your response to the Vacuum advance . I made a post here about my 427 heating at idle and it never ran like I felt a 427 should . Even though its in a full sized 69 CST long bed at 4500 lbs it should get out of its own way . I was a GM mechanic for many years and I knew the vacuum advance was critical to gas mileage and idle quality . I made a mistake by hooking it up to ported vacuum ! I hooked it up to manifold vacuum and my idle quality returned even with a mild cam . My heating problem vanished and my horsepower on take off went through the roof . That old truck will lay down 300 feet of posi marks if you can hold it straight !! Im a very happy camper now :0) thank you so much !
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