I think (!!!!!)....the R had a much longer stroke than a 730 and was slower turning. 1000 rpms @ rated power. That's pretty slow, but understandable for big engines built in the '40s. A 730 could be had in a "standard" or wheatland configuration which would look similar to the R also.

The R morphed into the Model 80, which had a bigger engine than the R. The 80, then the 820, then the 830 (last of the big 2 cylinders), were basically the same tractor. Starting with the R, they all had pony-motor start.

Thanks for the photos of the barnyard tractor pull. We have a large group in our area pulling them also. Typically 13 or so pulls during the summer, excluding rain-outs. Very-very popular events. But maybe this pull was open without many rules.

Not to be a spoil-sport, but the 460 might be modified a bit much for barnyard pull, and we don't allow riders on the tractors, only drivers.