Best average torque & power of any sub . 600" lift Gen. IV HEMI cam tested. Runs great from 2500-6500 RPM. LST lobe profiles and #26918 valve springs allow 7000 RPM+. Developed on the Dyno - COMP Cams leveraged our in-house dyno and Spintron machine to develop our new HRT camshaft profiles. After months of testing, our HEMI camshafts are to outperform the competition. Results - Thanks to extensive in-house testing, research and development, our HRT Stages 1, 2 and 3 camshafts are dyno-proven to delivery huge gains. Choose a Stage that is specific to your engine, whether it be a 5.7, 6.1 or 6.4 and enjoy the gains. CK/MK Kits - In addition to our new camshafts, COMP Cams has created all-inclusive kits to tackle the entire job. CK-Kits include camshaft, phaser limiter, pushrods, Beehive/Conical springs, steel retainers, locks, seats and seals. MK-Kits include everything from the CK-Kit plus drop-in performance lifters. Made in USA Fit type: Vehicle Specific