Crower is now offering Hydraulic Roller Lifters compatible with both early and late model SBC and BBC engines, complete with the High Pressure Pin Oiling option (HIPPO). Highly praised among Solid Roller Lifter users, Crower has incorporated the same HIPPO option into the hydraulic roller lifters to deliver superior performance coupled with dependable longevity that surpasses the likes of cheaper standard hydraulic roller lifters. The SBC 66310H and BBC 66321H both feature .300” taller lock blades and 2.200” pushrod seat heights and are tested thoroughly for optimum efficiency in operation, making them the perfect option to retro-fit both early and late model high endurance applications.