COMP Cams 15956-16 Short Travel Race Hydraulic Roller Lifter with Link Bar for GM LS Application, (Set of 16) For GM LS application using RHS Blocks 0.005 inches recommended preload 0.842 inches diameter; 145 gram weight; 2.66 inches seat height Limits the lifters internal piston movement for increased durability & performance at higher rpm REM-surfaced and black oxide to reduce valve train friction, wear and lubrication temperatures