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HH56 wrote:
The dampers are of different type construction which explains the thickness variation. Don't remember reading anywhere if a specific damper choice was determined by engine , by year, or by belt width.

HH56 wrote:
I don't have a tool catalog later than 50 but that one shows a profile of the two types of pullers. The description might also give an indication of when a particular type damper was used as it seems to be predominately on models that had wider belts. After the 288/327 block came along in 48, with the exception of the 356 engine used on the Super thru 47 and the Custom Eight thru 50, they started going to narrower belts.

Another catalog has instructions for the J2582 and says the "jaws" or "hooks" are placed in the belt groove. Don't have a catalog or supplement later than 50 so not sure if there was any added or changed parts to the basic puller for the 51-4 dampers, Do know 55-6 dampers had a different construction with vulcanized rubber between two metal sections that held them together. A tool similar in principle to the J2582 was used except the puller was a single rectangle piece that had an opening on one long side that went behind the entire damper. The opening was slightly larger than the crankshaft and pulled on the solid metal damper hub.