I checked for drain holes in some later 5.5 or 6 horse motors I have in pieces here and could only find a drain hole in the left channel for the lower cylinder, nothing in the right channel for the upper cylinder. The left channel drain hole is connected to the lower half of the check valve and I’m not sure where the upper half connects to the top cylinder. Maybe I’ll blow some air thru it to find out if it is connected or not.
I don’t have a ’54 or ’55 block nearby but I’m sure they had puddle drain holes in both channels. If I move a bunch of stuff around I will pull one out to check.
