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Lifters: Hydraulic Flat-Tappet: A camshaft follower having a flat surface at the point of contact with the cam lobe. Flat-tappet lifters actually have a shallow convex curvature at their "face" to allow the lifter to rotate during operation, extending the working life. A hydraulic lifter incorporates a mechanism that automatically adjusts for small changes in component dimensions, and usually maintains zero lash in the valvetrain. Hydraulic lifters also offer a slight "cushioning" effect and reduce valvetrain noise.
Roller Solid Or Hydraulic: A camshaft follower having a round, rolling element used at the contact point with the cam lobe. A hydraulic lifter incorporates a mechanism that automatically adjusts for small changes in component dimensions, and usually maintains zero lash in the valvetrain. Hydraulic lifters also offer a slight "cushioning" effect and reduce valvetrain noise. Solid lifters lack this hydraulic adjusting mechanism and require a running clearance in the valvetrain, usually adjusted by a screw or nut on the rockerarm.

Solid Flat-Tappet: A camshaft follower having a flat surface at the point of contact with the cam lobe. Flat-tappet lifters actually have a shallow convex curvature at their "face" to allow the lifter to rotate during operation, extending the working life. Solid lifters lack an automatic hydraulic adjusting mechanism and require a running clearance in the valvetrain, usually adjusted by a screw or nut on the rockerarm. Solid lifter cams usually generate more valvetrain noise than hydraulic-tappet cam.
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