lifter galley crossover tube

The SBC and SBM crank oil holes are identical, Hmm. So senses the right and left banks are 90* apart it would be hard to oil them from the side of the block or from the main caps, you would have to do them both. The left bank you could do from modifing the stock oil hole, the right bank you would have to modify the main cap and bearing. Drilling the cap will definitely weaken it so I would use a steel cap.