Reply to "Cam Bearing oil restrictors"

Another thing to consider when adding restricters: that #1 cam bearing passage also supplies a 'divot' on the edge of the block. This is a controlled leak for lubing the backside of the camshaft sprocket, which otherwise wears the front of the block and the sprocket. And a few have tapped into that short passage with a small drill to provide a squirt of oil into the cam/distributor gear drive mesh.

I've always wondered if what a NASCAR racer once said was true- the prototype 351-C oiling system was similar to solid lifter 427 FE blocks, but some committee altered the block architecture late in the game for hydraulic lifters, since it looked like performance-only engines were not the future in 1970. That might explain what some call the "Byzantine" configuration of the Cleveland's oiling map (partially corrected in the 429/460 blocks).