BBTV 687 Engine Piston Ring

Engine Piston Ring for Chrysler, Dodge, and Plymouth

This engine piston ring is built for a wide range of classic Chrysler, Dodge, Plymouth, and Fargo applications with a 3.400-inch bore and standard oversize. It uses a grey iron top ring, grey iron second ring, and a steel rail/stainless expander oil ring package for a direct service replacement in compatible 6-cylinder engines.

Key Features

• 3.400-inch bore size, 86.36 mm metric equivalent
• Standard oversize for service replacement applications
• Grey iron top ring and second ring construction
• Steel rail and stainless expander oil ring design
• Chrome and phosphate surface treatments for ring durability
• Fits 6-cylinder engine applications

Detailed Description

Part number 687 is an engine piston ring set specification for older Chrysler-family engines that require a 3.400-inch bore. The ring package combines a phosphate-coated top ring, a grey iron second ring with phosphate treatment, and a chrome-treated oil ring assembly with a steel rail and stainless expander. This combination is used to restore cylinder sealing, oil control, and compression performance in engines such as the Dodge Dart, Plymouth Valiant, and Dodge D100 Pickup when the engine is being rebuilt to standard dimensions. Part number 687 is also cross-referenced to Monroe Shocks & Struts 244P and 5637X for the same application.

Common Uses

• Restores compression loss caused by worn piston rings
• Helps reduce oil consumption from poor ring sealing
• Addresses blow-by from cylinder wear or ring fatigue
• Supports rebuilds on standard-bore 6-cylinder engines
• Replaces rings damaged by heat, carbon buildup, or age

Installation Notes and Tips

Verify bore size, ring groove dimensions, and engine application before installation. This part fits 1960-1987 Chrysler, Dodge, Plymouth, and Fargo vehicles in the listed applications, including Fits 1960-1976 Dodge Dart, N/A and Fits 1960-1976 Plymouth Valiant, N/A. Confirm ring end gap and cylinder condition during engine assembly for proper sealing.

Quality Assurance

Use this ring set as a standard replacement for the specified engine family and bore size. The listed materials and surface treatments support consistent sealing and wear characteristics during engine rebuild service.