Block tubing, got some questions.

Krooser said
Okay....so the tube is meant to supply oil to the front main bearing by cutting off the leaks at the lifters.

After the tube is installed you drill a passage in the tube at the front of the block directing the oil into the oil passage that feeds the main bearings, correct?

Just making sure we are on the same page.

Charles Sanborn also blocked the lifter valley above the camshaft to allow the splash coming from the crank to lube the cam and lifters. He drilled and tapped the block to accept aluminum block off plates that covered those oval holes in the block.

Has anybody used the aftermarket block off plates that I occasionally see offered ?

Spot on. I reamed all the passages from the main galley to the main bearings to 9/32 first, then after I had the tube in and peened I went back and drilled through the tube with the same size drill. Spent a little time getting the burrs out at the end, I found the ream actually helped with that some, doing one final pass.

I got a copy of the post that Charles posted back in the day, it all seemed to make decent sense to me. Only thing I didn't do was a direct feed to the front of the main as I'm not running a remote filter to provide an easy spot to tap in to.