NOTE:MUST SELECT RATIO: Includes 16-rockers and 2 shafts, appropriate spacers and assembly lube Extruded high-strength aluminum body Roller tip to reduce friction and improved geometry Adjustable with lock-nut Anodized blue with Mopar logo Can be used with Hyraulic, Machanical or roller camshafts NOTE: hi-ratio rockers in A and B/RB engines may require grinding on block and head for clearance.