Solid Flat Tappet Lifters

Solid Flat Tappet Lifters- These lifters have no internal hydraulic mechanism to take up clearance. They require valve lash, or the clearance needed for the lifter to unload when the cam comes around. This clearance is required to compensate for changes due to heat. Although these are uncomplicated and have no moving parts, they require special oils and oil additives, produce valvetrain noise, and require routine valve adjustments and maintenance. In many applications a hydraulic roller can make similar power without the these drawbacks.