340 vs 360 Difference in Harmonic Balancer Weights for Externally Balanced Motors

I always thought it looked like a pretty sizable difference between harmonic dampener weights between the factory “use for cast iron 340 only” and “use for cast iron 360 only” . The longer stroke on the 360 crank seems to be the major factor. The 340 cast pistons were heavier due to full floating piston pins and greater compression height but the 360 weight is still larger between the two.