Does anyone have any thoughts on why FoMoCo opted to go back to the 1.43:1 rockerarm ratio after using 1.54:1 for 1956 and 1957?

Is there any valve train geometry issue (pushrod, rockerarm shaft, rockerarm, or valve stem location... or the angle of the valve in the cyl. head) that makes 1.43:1 better in reducing valve guide wear or some unwanted force factor?

Thanks for your input.

NoShortcuts
a.k.a. Charlie Brown
near Syracuse, New York