who is running MRL (BAM) Lifters without lifter bore sleeves

Bushing the lifter bores should be done after there straightened out. The bushing should be sized by the machinist and oil feed holes drilled into it. The tubbing of the lifter bores is a restriction designed to regulate the amount of oil to the lifters. Without the restriction, oil just pours out! Horrendously!

I have seen people drill oil feed holes that range from .030 to .070 of an inch. What is right? I do not know.