Product Description

4.3L V6 Replacement Rocker Arm – Replaces 12555580, 180-1317, MR-903 and R-903

Sold Individually – Fits Select 2000-2014 Chevrolet, GMC, Isuzu and Oldsmobile Applications

Replace a worn or damaged valvetrain component with this 4.3L V6 rocker arm for select Chevrolet, GMC, Isuzu and Oldsmobile vehicles. Sold individually, this replacement rocker arm cross-references part numbers 12555580, 180-1317, MR-903 and R-903 and is intended for the supported naturally aspirated, gasoline OHV 4.3L V6 applications. Coverage includes select pickup trucks, SUVs and vans within the supplied 2000-2014 range, making it an option for individual rocker arm replacement during cylinder-head or engine service.

Key Features & Benefits

• 4.3L V6 Valvetrain Replacement: Intended for the listed naturally aspirated gasoline OHV 4.3L V6 applications. This replacement rocker arm provides an individual service component when repairing a compatible engine's valvetrain.
• Multiple Part Number References: Replaces 12555580, 180-1317, MR-903 and R-903. These references help identify the corresponding rocker arm when matching the replacement to an existing part or engine repair parts list.
• Sold as One Rocker Arm: Each selected quantity includes one replacement rocker arm. The individual purchase format allows you to order the number needed for your repair without purchasing a complete engine set.
• Pickup, SUV and Van Applications: The supplied coverage includes select Silverado, Sierra, S10, Sonoma, Blazer, Jimmy, Astro, Safari, Express and Savana configurations. Additional listed applications include Isuzu Hombre and Oldsmobile Bravada models.
• Individual Engine-Service Component: Suitable for replacing a worn or damaged rocker arm during service on a supported engine. The specified engine configuration and replacement part numbers provide the key references for selecting this component.

Key Fitments

General application coverage includes the models, trims and engine types below within the supplied year range. Coverage varies by vehicle and engine configuration; the overall range does not indicate that every listed model fits every year.

Application Years

• 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014

Vehicle Models

• Chevrolet, GMC, Isuzu, Oldsmobile: Astro, Blazer, Bravada, Express 1500, Express 2500, G30, Hombre, Jimmy, S10, Safari, Savana 1500, Savana 2500, Sierra 1500, Sierra 1500 Classic, Silverado 1500, Silverado 1500 Classic, Sonoma

Listed Trim and Body Configurations

• Base Crew Cab Pickup 4-Door
• Base Extended Cab Pickup 2-Door
• Base Extended Cab Pickup 3-Door
• Base Extended Cab Pickup 4-Door
• Base Extended Cargo Van 3-Door
• Base Extended Passenger Van 3-Door
• Base Extended Passenger Van 4-Door
• Base Sport Utility 2-Door
• Base Sport Utility 4-Door
• Base Standard Cab Pickup 2-Door
• Base Standard Cargo Van 3-Door
• Base Standard Cargo Van 4-Door
• Base Standard Passenger Van 3-Door
• Diamond Edition Sport Utility 4-Door
• Envoy Sport Utility 4-Door
• HT Standard Cab Pickup 2-Door
• LS Crew Cab Pickup 4-Door
• LS Extended Cab Pickup 2-Door
• LS Extended Cab Pickup 3-Door
• LS Extended Cab Pickup 4-Door
• LS Extended Passenger Van 3-Door
• LS Sport Utility 2-Door
• LS Sport Utility 4-Door
• LS Standard Cab Pickup 2-Door
• LS Standard Passenger Van 3-Door
• LS Standard Passenger Van 4-Door
• LT Crew Cab Pickup 4-Door
• LT Extended Cab Pickup 3-Door
• LT Extended Cab Pickup 4-Door
• LT Extended Passenger Van 3-Door
• LT Sport Utility 4-Door
• LT Standard Passenger Van 3-Door
• LT Standard Passenger Van 4-Door
• S Extended Cab Pickup 2-Door
• S Standard Cab Pickup 2-Door
• SL Crew Cab Pickup 4-Door
• SL Extended Cab Pickup 2-Door
• SL Extended Cab Pickup 3-Door
• SL Extended Cab Pickup 4-Door
• SL Extended Cargo Van 3-Door
• SL Extended Passenger Van 3-Door
• SL Sport Utility 4-Door
• SL Standard Cab Pickup 2-Door
• SL Standard Passenger Van 3-Door
• SLE Crew Cab Pickup 4-Door
• SLE Extended Cab Pickup 2-Door
• SLE Extended Cab Pickup 3-Door
• SLE Extended Cab Pickup 4-Door
• SLE Extended Passenger Van 3-Door
• SLE Extended Passenger Van 4-Door
• SLE Sport Utility 4-Door
• SLE Standard Cab Pickup 2-Door
• SLE Standard Passenger Van 3-Door
• SLS Crew Cab Pickup 4-Door
• SLS Extended Cab Pickup 2-Door
• SLS Extended Cab Pickup 3-Door
• SLS Sport Utility 2-Door
• SLS Sport Utility 4-Door
• SLS Standard Cab Pickup 2-Door
• SLT Crew Cab Pickup 4-Door
• SLT Extended Cab Pickup 3-Door
• SLT Extended Cab Pickup 4-Door
• SLT Extended Passenger Van 3-Door
• SLT Sport Utility 4-Door
• SLT Standard Passenger Van 3-Door
• Trailblazer Sport Utility 4-Door
• WT Crew Cab Pickup 4-Door
• WT Extended Cab Pickup 4-Door
• WT Standard Cab Pickup 2-Door
• XS Extended Cab Pickup 2-Door
• XS Standard Cab Pickup 2-Door
• Xtreme Extended Cab Pickup 2-Door
• Xtreme Extended Cab Pickup 3-Door
• Xtreme Sport Utility 2-Door
• Xtreme Standard Cab Pickup 2-Door
• Z71 Crew Cab Pickup 4-Door
• Z71 Extended Cab Pickup 4-Door
• Z71 Standard Cab Pickup 2-Door
• ZR2 Extended Cab Pickup 2-Door
• ZR2 Extended Cab Pickup 3-Door
• ZR2 Sport Utility 2-Door
• ZR5 Crew Cab Pickup 4-Door

Engine Types

• 4.3L 262Cu. In. V6 GAS OHV Naturally Aspirated
• 4.3L 4293CC 262Cu. In. V6 GAS OHV Naturally Aspirated
• 4.3L 4294CC V6 GAS OHV Naturally Aspirated