Abstract: A roller valve lifter and member for preventing rotation of the lifter in its bore, especially useful for high speed automotive internal combustion engines. The lifter has a flat or non-cylindrical portion along its length. A non-movable member has an elongated portion received within the bore that cooperates with the non-cylindrical portion to prevent rotation. The non-movable member is located along one side in the bore, out of alignment with a transverse oil passage that communicates with plural lifter bores in series.