COMP Cams Lifters 2921-12 COMP Cams Performance Series Solid/Mechanical Lifters are premium lifters designed specifically for high-end street and race applications. Built to extreme precision tolerances to create the most durable solid lifters available, Performance Series Lifters are engineered to handle elevated, race application valve spring pressures. Each lifter features a precision-ground crown radius and surface finish to extend high-rpm durability and promote compatibility with performance camshafts. Solid Lifter, Chrysler Perf Series COMP Cams Performance Series Solid/Mechanical Lifters for Small and Big Block Chrysler, Set of 12 COMP Cams Solid Lifter Chrysler Perf Se