I have a 272 y block from a '55 Mainline that I am having rebuilt.  I am aware of a bit of discussion about oiling problems for the rocker gear in these motors.  Interested if this is a problem and if yes how it can be overcome overcome.

Thanks and regards

Maffra

Here are some previous threads on the subject.  As Glen mentions, using the search function will bring up some more.

Center cam bearing

Grooving the center cam hole in the block

Oil Flow Diagram

Pressurized rocker shafts

Pressurized rocker shaft more

Pressurized timing chain oiling

Rocker arm overflow tubes Cons

Rocker arm overflow tubes Pros

Rocker arm overflow tube More Pros

Timing chain oil trough

Adding lifter valley holes for camshaft oiling

Drilling additional holes for oiling and/or venting

Valley holes for aiding crankcase evacuation

Regards