My take on the oiling system crossover tube for the small block

You said in a previous post that you completely cut the flow to the drivers side lifters. That is why you do not have a problem, not because of your lifter clearances.
You still have not told us how you change your cam bearing clearance.
I have solid lifters, and I do not have a problem because of good lifter clearances and plugging the flow to the driver side. I did not change cam to bearing clearance, just checked it