The 2 numbers are the max advance built into the can.
More than you want to know about this is here:
https://www.crankshaftcoalition.com/...ance_Specs.pdf
The only other thing I will add is always obey the rule and the rule is always use non-ported vacuum.
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70Z28 04B Norwood Forest Green-white Stripes Black DeLuxe Interior
Owned since 1978 - First Car
Last edited by BCreekDave; 01-04-2019 at 12:46 PM.
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