Tim:
Once again, thanks for the quick response.
Besides the broken copper tube, I found 3 valves stuck in their bores and
accordingly bent push rods. But, got those working again. New push rods on order.
Do you suppose this was the cause of the stuck valves? The engine has
been sitting idle for years.
I guess the "fix" is to braze the tube back in place. Only a horizontal piece of the tube remains in place. The diagram you supplied seems to show the tube is a complete loop back down to an oil exit hole in the head. Should the repair be as shown or does is really make any difference?
Jerry

1 1951 Chev Panel with a 350 small block, automatic tranny.
1 2004 Chev 2500 HD pickup... stock
1 1950 Chev 5 window pickup; 261 c.i. engine, 4 on the floor.

With lots of time and money, any Stovebolt can be restored.