Engine Pro's Help please

I use .035 holes in the lifter bore bushings for most solid roller setups. I dont sleeve for hydraulic lifters, because the slot in the lifter in some is narrow and wont be near pressurized oil for very long. Add to it the flow for the upper end.. I'd say use the lifter feed hole as the minimum size (prob close to .060) because that will be the resriction. A larger hole will have pressure for a longer time than a smaller hole. I've never tried what you're doing.. you'll have to report back how well it works...