How about 170 to a 225...
CRANKSHAFT STROKE
170: 3.125"
198: 3.640"
225: 4.125"
bore and head being the same. It is said the head determines HP potential and the stroke determine where that peak power comes in all things being equal. So the 170 and the 225 had the same HP potential but the 225 brought it in at a much lower useable RPM.
