BBTV 2C4903 Engine Piston Ring

Engine Piston Ring Overview

This engine piston ring, part number 2C4903, is built for 3.622-inch bore applications with standard oversize dimensions. It uses chrome-treated top and oil ring surfaces, along with a steel top ring and a steel rail/stainless expander oil ring design for consistent sealing performance.

Key Features

• Part number 2C4903 for direct catalog matching.
• Standard oversize sizing for 92.00 mm bore applications.
• Chrome top ring surface for wear resistance.
• Steel top ring and grey iron second ring construction.
• Steel rail and stainless expander oil ring design.

Detailed Description

Part number 2C4903 is an engine piston ring set for six-cylinder engines with a 3.622-inch bore. The ring package combines a chrome-coated top ring and chrome-treated oil ring surface with a phosphate-treated second ring, giving the assembly a durable surface profile for cylinder sealing and oil control. This configuration is used in a range of GM and Chrysler applications, including Chevrolet Impala, Chevrolet Monte Carlo, Chevrolet Venture, Pontiac Grand Am, and Oldsmobile Alero engine rebuilds.

This part cross-references Monroe Shocks & Struts (e.g., 41861, 12538691) for the same application.

What It Is Used For

• Restoring cylinder compression after engine wear.
• Controlling oil consumption from worn ring packs.
• Reducing blow-by caused by poor ring sealing.
• Replacing damaged or heat-worn piston rings during overhaul.

Installation Notes and Tips

Verify bore size, ring groove dimensions, and cylinder count before installation. Match the ring set to the engine specification and confirm the top ring surface treatment against the application notes. Proper ring end gap measurement and cylinder preparation are critical during engine assembly.

Quality Assurance

Use this part number 2C4903 to confirm application coverage against the listed fitment. The chrome and phosphate surface treatments, along with the steel and grey iron ring materials, support consistent rebuild specifications for the listed engine families.