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1 Here are all the components we ordered from Comp Cams to update, strengthen, and refurbish the bulk of our valvetrain. The main part of this is the next generation of Ultra-Gold ARC series aluminum rocker arms. They have been designed to enhance valvetrain stability and improve oiling while fitting under stock valve covers. Exclusive spiral lock type clips replace retaining clips for improved durability. They come in 1.5, 1.6, 1.65 with 3/8 or 7/16 studs for the small-block, 1.7 on a 7/16-inch stud for the big-block, and 1.72 and 1.82 on a 8mm stud for the LS series. We'll go into more detail on the other product later in the story.