These short travel retro-fit XD hydraulic roller lifters feature a billet seat and short travel. These lifters' short travel allows for light pre-load and reduced oil for the highest revving lifter for factory, RHS, LSX and Warhawk LS. PartNumber : cca15956XD-16 Description : COMP Cams Lifters LS1 Retro-Fit Short Travel Hyd Rlr California Proposition 65 : WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov Engine Family : Chevrolet LS Series, RHS, LSX and Warhawk Lifter Diameter : 0.842 Lifter Type : Retro-Fit Link Bar Hydraulic Roller Link Bar Included : Yes Plunger Travel : Short Seat Height : 2.66 Title : XD Short Travel Link Bar Hydraulic Roller Lifter Set GM LS, LSX, RHS, Warhawk Weight : 145 Engine Components::Lifters