If the head is smooth between #5 and #6 then it is a 1950 to 52 low pressure motor. In Canada they used the same casting number for the 216 and the 235 heads and blocks for that motor.

That reference was to a page that I think one of our members, might have composed.

1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed

My Chevy Master 4 Door is on the Road!