Hi Gene

That makes sense.

Most of my info sources are from the USA.
You point out that the low pressure 235's oiled the rocker arms from the rear camshaft bearing.
The blocks on Canadian 216's from about 1951 up were more akin to 235's in that they had the short push rod cover etc.
So did the late Canadian 216's also oil the rocker arms from the rear camshaft bearing?

BTW
My 1946 truck is American in origin. :-)