Quote: You would figure the stroke for the 4.125 crank at 2.0625 and the stroke for the 4.250 at 2.125. So 2.0625 plus 6.2 plus 1.2 piston equals 9.562.5.Or 2.125 plus 6.3 plus 1.2 piston equals 9.525 hope this helps.
