COMP Cams developed a new oiling system that ensures consistent roller wheel and axle lubrication. COMP Cams Race XD Solid Roller Lifter sets are available in 0.842” and 0.904” diameter bodies for both Chevrolet Small Block and Big Block engines. 0.080” and 0.160” offset seats are available for 0.842” diameter lifters while 0.090” and 0.180” offset seats fit the 0.904” diameter lifters. All pushrod seats are designed to accommodate both 5/16”and 3/8” ball pushrods.