Ive tubed blocks for others but myself, (running composit solids), have never needed to, im not sure if its because I start out with new blocks or very low use oem blocks with good lifter bores.

I know the uncovering deal is an issue for some but the couple very early 360 block I use have not been a problem, ive a mid 70-s 360 block that I didnt use because it would of been the one.

With the op being good all the time and main bearing always looking good on the winter inspection ive never really given it a second thought because its never presented a problem.

But the .003 is alot of clearance.