COMP Cams Rocker Arms GM LS3 1.8 Bolt DNew LS Specific Ultra Pro Magnum Rocker Arms From COMP Cams Increase Ratio And Stiffness Over Stock Rockers, While Also Increasing Lift without The Need To Swap Cams. As LS engines continue to grow in popularity, COMP Cams has expanded its line of Rocker arms to build components specific to LS Applications. For LS3 L99 L76 Rectangle Port Head LS ApplicationsFull Set Of 16 Bolt Down Rockers Includes Bolts1. 8: 1 RatioThis Part Fits: Year Make Model