Help understanding GM vacuum advance codes

01-03-2019, 07:50 PM

ScottG ScottG is offline

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Help understanding GM vacuum advance codes

I am looking for an original GM advance unit. 1970 Buick GS350. A search finds a lot of them . Most have an M or an MS at the top. Then a three digit number that looks like it could be the last three numbers of the part number? Then a 2 digit number that could be the degrees of advance it gives? Thanks for the help...

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1971 Boss 351 , 17,000 miles .. 1971 Buick GS455 .. 2003 SVT Cobra .. 1971 GTO .. 1969 Camaro Fathom Green .. 1969 Camaro Hugger Orange .. 1970 Buick GS455 .. 1970 BUICK GS350 .. 1998 SVT Cobra 1900 miles;. 1973 STAGE 1 GS . 1971 Mach 1 351C 4 speed , first car. 1970 Mach 1 428 SCJ . 1970 SS 350 Camaro . 1971 442 ... 1968 Buick GS400 . 2015 Lexus IS 350 F Sport 2021 Badlands Bronco Sport

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