340 Vs 360

I don't know where in 'ell people get this "rev fast," "rev slow" nonsense. An engine only revs UNDER LOAD as fast as the HP/ torque output and the gearing allow.

The fact is that the longer the stroke, the faster the pistons move, so if you want to talk about "last a long time" in theory the pistons, rings and cylinder walls on a short stroke engine should last LONGER when operated at the same RPM

There's a lot more to engine design than the length of the crank arm