For 1966 GMC P1000 Rocker Arm 38191SJHX Stock

For 1966 GMC P1000 Rocker Arm Kit 46682PBDH Rocker Arm Stock

For 1966 GMC P1000 Rocker Arm Kit 69162NBQS Rocker Arm Stock

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

Engine Rocker Arm Pivot-Stock Melling MRM-1798

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

Engine Rocker Arm Ball-Stock Melling MRM-1804

For 1966 GMC 1000 Rocker Arm Kit 95594TYGD 4.1L 6 Cyl Rocker Arm Stock