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

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

For 1966 GMC I3500 Rocker Arm Kit 19778YQMP 4.1L 6 Cyl Rocker Arm Stock

For 1966 GMC PB3500 Van Rocker Arm Kit 71833YRDK 4.1L 6 Cyl Rocker Arm Stock

For 1966 GMC PB2500 Van Rocker Arm Kit 16188DTZY 4.1L 6 Cyl Rocker Arm Stock

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

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

For 1966 GMC PB15 Series Rocker Arm Kit 29797TYQW Rocker Arm Stock