does an RB have to be bushed for a Mech Roller Lifter

it's always easier to run hydraulic than a solid, no rocker adjustment needed. if you have a street hotrod and don't need to rev past 6000rpm they'er fine but above that and you have the same problems as with a hydraulic flat tappet. the best roller lifter in my opinion are crane but others may have found another brand as good or better. i've never bushed the lifter bores in any of my motors.