.903 Solid Lifters?

pishta said
When I was researching solid roller 426 lifters, I saw some that were spec as .903 and the same place had 440's as .904. Maybe it was for clearance or tolerance or something. Weird, were the hydros .903 also?

I did not look at the hydraulic lifters, just solids.
Maybe when you bush a lifter bore you use .903's? Just guessing