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What are the specs (inches Hg start & end) for the Vacuum Advance Control marked MS 427 16?
All I found in looking this up was that 427 stands in for GMPD part number 1973427, the Delco number is D1315A, and the maximum crank advance is 16°. I didn't find anything on the vacuum part of the specs.
Here's a picture of what I have. Would need to translate distributor number to engine family. The one with the ink marks is a 1970 350-4bbl automatic AC application from my first Cutlass but I don't know what the rest of them are.