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Old 10-09-2006, 01:16 PM
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Ported Vaccum or Intake

Iam currently working on a 72' corvette with the original 350 with an edelbrock 600cfm carb and in take on it. I was swaping distributors for an accel HEI unit with vacuum advance but on the carb i could not find any ported vacuum to hook the advance up to, i have talked to some other people about this and they said that GM runs on intake vacuum for the advance but regardless of where i run the vacuum hose to the car just doesn't run right. If i take the hose off it runs good but has no vacuum advance. Timing is spot on. Any ideas?? Thanks

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Old 10-09-2006, 03:53 PM
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vac advance

go to this site;www.camaros.net/forums/showthread.php?t=17599 and your answer will in there, towards the end in a section called "vacuum advance 101". I asked the same question about a week ago. If you can't get it , the answer is manifold vac....
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Old 10-09-2006, 04:37 PM
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don't buy an Accel anything, unless you want to replace it later on when it fails
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Old 10-09-2006, 04:43 PM
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Stock Chevys use ported vacuum for the advance. Its at the front of the carb about 1/3 of the way up.

Ported or manifold advance is an ongoing debate amongst hotrodders.

BTW, this being a vacuum question, I am moving it to the engine forum.
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