I have wondered about the parasitic loss due to big bore with short stroke versus small bore with a long stroke
I've always though that RPM was RPM ,no matter what the bore and stroke was for the same C.I. motor
I understand the N/A Pro Stock type motors use a large bore(4.625+) with a short stroke to meet the rules of 500 C.I. but how much of that is to get the bigger valves in the heads versus running a 4.350 bore with a long enough stroke to make 500 C.I.?