Odd Crank Bearing Question

Please check, Pishta, if you would please.

The change to the heavier rods might well be a concurrent change, but I am not quite seeing why 32 gram heavier rods would necessitate a change to the thrust bearing surface size..... Maybe it was just a durability improvement... and maybe matches machining on the 360? Since the 273 and 340 had been dropped by that time, that might explain it.

(And 318's picked up the cast crank when they first came out, and shared that with the later 273's.....IIRC.)