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The reason T&D big block Chevy systems are so popular is the stand to which the shaft-mounted rocker arms are attached. Sound engineering is behind this rigid one-piece stand that in most cases takes no machining to fit big block cylinder heads. It not only makes for a rock-solid mounting spot for improved valve train stability and valve lash consistency but acts as a cylinder head girdle. Beyond that, the complete T&D system has proven to increase valve, guide and spring life, even in the most extreme lift/duration environment.