The Stovebolt Site Forums The Shop Area Engine Shop What Is Supposed To Be Here?

I dimly recall that in some years, there might have been a hole in bottom edge of the block or in the top edge of the oil pan.

Or, a clip that was used up through 1953: 3659432 - 1941-1953

http://chevy.oldcarmanualproject.com/parts/1929_54/085a.htm

Also, in some years and maybe only some models, the spring ran back to the brass block drain cock (maybe 1954 and onwards?).

It might be that 1941-1949 235 (and 1941-1953 216) used a different spring than was used on 235s from 1950-1959?