Some 235’s have the oil filler cap in the middle and some have them up front. What years had which? I’m thinking this might be a general way to differentiate whether you are looking at an old motor or a newer version motor if you can’t see or get to the casting number easily..
Chuck 1950 Chevy 1/2 ton (all original) 1951 Chevy 1/2 ton (future streetrod) 1941 Chevy coupe 1938 Chevy coupe streetrod