[Jack21]

Hydraulic rollers come in most factory cars today. Less friction lost to valvetrain = more fuel economy. My CompCams roller kit came with stock Ford hydraulic roller lifters.

Roller lifters need to be kept perpendicular to the cam, and a link bar keeps them that way. Non-roller lifters must rotate on the cam, so, no link bar.

Solid rollers are generally (but not always) race only items.

A little more expensive than a non-roller hydraulic but the torque will astound you!