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Old 01-22-2003, 03:39 PM
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Post Vacuum advance

What is the purpose,if any,of plugging the vacuum advance on an HEI distributor?Somebody please help as I don't know if I should run a vacuum line to the carb.It's a built pont. 400.Thanks.BFP

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Old 01-22-2003, 03:47 PM
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IF YOU RACE ONLY DONT USE VACUMN ADVANCE, BUT IF YOU DRIVE ON THE STREET RUN ADVANCE, FOR ECOMANY AND POWER.
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Old 01-22-2003, 03:48 PM
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HEY BRUCE: Let me latch on your post. I am finding conflicting opinions on whether to have vacuum on point type distributor at idle? Some say yes some say no???????????????? THANKS
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Old 01-22-2003, 03:56 PM
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It won't be a "racer" but will be driven hard on nice days.We just got about 9 inches of snow!The block is a '75 400 w| '68 400 heads.It really moves out.I just want to know if it's better to have the advance hooked up.By the way it has an HEI distribtor.Thanks again.BFP
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Old 01-22-2003, 04:03 PM
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Dave, to answer your question, you don`t need vacuum advance at idle, it`s needed on acceleration. it doesn`t matter the type of distributor, base timing is set at 12 degree`s before top dead center for example, a vacuum advance at idle would make it 22 degree`s, needless to say, it wouldn`t idle very well.
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Old 01-22-2003, 04:08 PM
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You dont want vacuum at idle, going to the distributor. An easy way to tell if ya have the right port, is to start the engine, pull off a hose...stick yer finger on the port, and open the throttle halfway..if you feel vacuum, thats the one.

[ January 24, 2003: Message edited by: 72 chevy ]</p>
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Old 01-22-2003, 04:13 PM
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I know where to hook up the line,but what I was wondering is why someone would plug it up.Unfortunately I don't know much about the motor.It's clean,in and out, and like I said it's a ****** combo so is obviously not stock.The gist of it is, hook up the advance or not?
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Old 01-22-2003, 05:07 PM
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STREET YES TRACK NO.
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