For 1966 GMC 1500 Rocker Arm 33158DQMD 4.1L 6 Cyl Stock

For 1966 GMC 1000 Rocker Arm 74976VNBQ 4.1L 6 Cyl Stock

For 1966 GMC 2500 Rocker Arm 32743JSPX 4.1L 6 Cyl Stock

For 1966 GMC 1500 Rocker Arm Kit 45234HDPS 4.1L 6 Cyl Rocker Arm Stock

For 1966 GMC 1500 Rocker Arm Kit 48423PKQB 4.1L 6 Cyl Rocker Arm Stock

For 1966 GMC I3500 Rocker Arm 96261RHNW 4.1L 6 Cyl Stock

For 1966 GMC PB3500 Van Rocker Arm 54588NTGW 4.1L 6 Cyl Stock

For 1966 GMC PB2500 Van Rocker Arm 29697BFMQ 4.1L 6 Cyl Stock