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

I've heard through the grapevine that Hughes' hydraulic roller lifters are actually Hylift Johnson lifters, which have a reputation as being some of the best you can buy.

Topline manufactures them now and from their website:

In 2004, Hylift-Johnson Lifters was purchased as a division of TopLine Automotive Engineering. The previous Hylift O.E. lines that were in Zeeland, MI have now been relocated to the Muskegon plant. These high quality flat mechanical tappets, lash adjusters, buckets and encapsulated hydraulic roller lifters are being produced by the original Hylift machines and team. The same people that brought you “The Beautiful Lifter” are back manufacturing with precision and a dedication to quality that has not been seen in the lifter business for quite a few years. We feel the real value is not in the equipment or the plant but with the employees who have over 600 years of Hylift experience. Topline Hylift Johnson will continue its historical way of going to market by traditional means of distribution through a select group of customers.

Southernman