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It's a 10,000 day calender system used by Chrysler for engine stamp numbers. Not sure when it started, but 3139 is March 2, 1970. The calender I have (Galen Govier white books version) shows July 1, 1967 as 1799 but doesn't show anything earlier. I guess you could figure it out. As is the...

I have a 340 with the same type of numbers, OR247269. There's no way to tell what it's from. Numbers from the front of the block, just under the drivers side head, will reveal the day the motor was built up. It should read something like this, here is mine: FWP31390007 F = 1970 W =...