BCBC MRM-1796 Engine Rocker Arm Nut

Engine Rocker Arm Nut Overview

The Melling MRM-1796 is a standard replacement engine rocker arm nut for specific applications that require an open hex, extra-fine thread design. Made in the USA from carbon steel, it is built for rebuild work where fresh hardware is needed for proper valve train adjustment.

Compatible with a wide range of classic Ford, Pontiac, Buick, Mercury, Lincoln, Oldsmobile, Chevrolet, Jeep, and American Motors applications, this part supports stock-style engine service on vehicles such as the Ford Mustang, Pontiac Firebird, and Buick LeSabre. The MRM-1796 is a direct-fit hardware choice for rebuilders who need the correct rocker arm nut specification.

Key Features

• Standard replacement rocker arm nut for engine rebuild service
• Carbon steel construction for hardware durability
• Open hex nut design for straightforward wrench access
• Extra-fine thread type for the specified application
• Made in the USA
• Specific-fit hardware, not universal

Detailed Application Notes

Melling recommends replacing rocker arm nuts during engine rebuilds because worn threads, metal fatigue, and lost hardware can affect assembly quality. Using new hardware helps maintain proper installation and valve train adjustment. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Fits 1967-1981 Pontiac Bonneville, N/A. Fits 1967-1981 Pontiac Catalina, N/A. Fits 1967-1981 Pontiac Firebird, N/A. Fits 1967-1981 Pontiac Grand Prix, N/A. Fits 1969-1971 Ford Mustang, N/A. Fits 1977-1980 Buick LeSabre, N/A. Fits 1978-1980 Pontiac Grand Am, N/A. Fits 1980 Jeep CJ5, N/A. Fits 1980 Jeep CJ7, N/A. Fits 1980 Chevrolet Monza, N/A. Fits 1980 Oldsmobile Starfire, N/A. Fits 1980 Pontiac Sunbird, N/A. Fits 1980 Buick Electra, N/A. Fits 1980 Buick Estate Wagon, N/A. Fits 1980 Pontiac Phoenix, N/A. Fits 1980 American Motors Concord, N/A. Fits 1980 American Motors Spirit, N/A. Fits 1971 Ford LTD, N/A. Fits 1968-1971 Lincoln Continental, N/A. Fits 1968-1971 Lincoln Mark III, N/A. Fits 1968-1971 Pontiac Acadian, N/A. Fits 1968-1979 Pontiac Beaumont, N/A.

What This Part Helps Address

• Worn or damaged rocker arm nut threads
• Hardware loss during engine teardown or rebuild
• Valve train adjustment issues caused by reused fasteners
• Replacement of fatigued stock engine hardware
• Restoration of correct rocker arm fastening during assembly

Installation Notes and Tips

Verify thread specification and application before installation. Replace rocker arm nuts during rebuild work rather than reusing hardware with visible wear or thread damage. Follow the engine builder’s adjustment procedure to set valve train preload or lash correctly for the application.

Quality Assurance

Melling manufactures this rocker arm nut to material and quality standards for rebuild service. The part number is MRM-1796.