Ok. New to the site. I have a 57 y block build under way. The cam shaft I am using is an early cross drilled style WITH a shalow groove cut into it. It was the best cam I had out of the lot so I had it ground at a local shop. Now, the question is. Do I use cross drilled cam bearings or grooved cam bearings on this build? I am enclined to use cross drilled ones and to cut the groove deeper. My rocker shafts are modified to a pressurized systwem so oil pressure bleed out is not a concern I don't think. I'm curious about the difference between the two styles of cam bearing and what that difference is. Thanks in advance. I'll be back soon. JJ.