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 HEI VAC CAN ADJ.455 30 over w/6x4's
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Sitting Bull

184 Posts

Posted - 04 Aug 2018 :  12:21:49 AM  Show Profile  Reply with Quote
I have an adjustable vac can on my distributor and need the proper adj. procedure for setting timing. How many and which direction should the hex be turned ? I have a basic near stock cam . I would like to just get it so it runs and starts the best . Not really having any specific problem but just wonder if it can be better . Thanks for any help >

Edited by - bober on 24 Aug 2018 12:11:30 PM


467 Posts

Posted - 04 Aug 2018 :  11:00:26 AM  Show Profile  Reply with Quote
In advances timing, out retards. Go 2 turns per test, 5 either way bottoms it out if it is centered. Start with 10 at idle with vac unplugged. Or if you have a good timing light, 32 full mech advance with engine speeded up, then 40-45 degrees with the engine speeded to full advance with vac hooked up.

Or in 2 turns per test drive til it has slight preignition, then out two turns final setting as per moroso instructions. Jay

Edited by - Corncob2061 on 04 Aug 2018 11:21:13 AM
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Sitting Bull

184 Posts

Posted - 04 Aug 2018 :  4:01:35 PM  Show Profile  Reply with Quote
That will help for sure . I can do some tests now !
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