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

For 1966 GMC 2500 Rocker Arm Kit 96198TMZQ 4.1L 6 Cyl Rocker Arm Stock

For 1966 GMC 1500 Rocker Arm 51268VXCT 4.1L 6 Cyl 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 2500 Rocker Arm Kit 19551ZNJT 4.1L 6 Cyl Rocker Arm Stock

For 1966 GMC 1000 Rocker Arm 62284TRFJ 4.1L 6 Cyl Stock

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