S/N break is at 1194039, by s/n given both engines are DT466's 1183420 is a 210HP and 1215294 is a 195 HP. BUT below break bore is 4.301, after break bore is 4.59. Intake valves went from 1.786 to 1.970. Cyl hd part # are diff. Head gasket part #'s are differ... Login to read more.