Since the 235 has a longer stroke, the height of the dipper troughs on the spray-oiler engines will be different between 216 and 235 engines. A 216 pan on a 235 will make the rod dippers hit the troughs, and a 235 pan on a 216 will end up with oil-starved rods at idle. To avoid problems, dipper pans for 235's have "235" embossed into the bottom of the pan in numerals about 2" tall.
Jerry