When it comes to knowing the secret, hellish life of valvetrains, few companies anywhere know more about their inner workings than COMP Cams. Decades of research, development, and refinement under the harshest racing conditions have resulted in valvetrain products that can go the distance in street and competition machines. The full line-up of COMP Cams rocker arms, from the affordable investment cast chromoly Ultra Pro Magnum rockers to the state-of-the-art Ultra-Gold ARC Series aluminum rockers, can be relied on to faithfully translate the cam lobe motion into valve action without wasted mass or effort. The engine builders in the 2013 AMSOIL Engine Masters Challenge will be pleased to know that they will be able to select from a wide variety of COMP Cams rockers, all of which have been optimized for geometry, added clearance for large-diameter springs, and the best possible strength-to-weight ratio. For more info, log onto www.COMPCams.com.