My '47 AD with the original engine had a hand crank compatible damper and a hole in the lower radiator splashpan for the crank to go through. When I replaced the engine with a 216 from a '51, I moved the damper from the '47 to '51. I've got a crank, but only use it to position the engine for overhead and point gap adjustments.
1947 3100 Advanced Design
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