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Old 01-07-2018, 08:30 AM   #4
Dead Parrot
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Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,461
Re: 82 Chevy SWB 355 timing issues!!!

Low vacuum will play with the vacuum advance. Check the docs on that aftermarket unit to see when it comes in and how much. Also, check what you are adjusting with the adjustment screw. The Accell unit I have comes in, IIRC, at 11". The adjustment changes how much advance, but not when it comes in.

Might check what the vacuum secondaries are expecting for vacuum.
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