BBTV 2M4978 Engine Piston Ring

Engine Piston Ring for GM V8 Applications

This engine piston ring is built for GM V8 applications that use a 96.00 mm bore and a standard oversize specification. It is a fitment-based replacement for Chevrolet Silverado 1500, Chevrolet Tahoe, and GMC Sierra 1500 applications, with shallow top groove notes called out in the catalog data.

Key Features

• Top ring uses plasma moly surface treatment for wear resistance.
• Steel top ring construction for cylinder sealing performance.
• Second ring uses grey iron with phosphate surface treatment.
• Oil ring design combines steel rail and stainless expander materials.
• Cataloged for 8-cylinder engines with a 3.780 in. bore.
• Part number 2M4978 for application matching and ordering.

Detailed Description

Part number 2M4978 is an engine piston ring set specification for GM truck and SUV engines across Chevrolet, GMC, Buick, Cadillac, Hummer, Pontiac, and Saab applications listed in the fitment data. The ring package includes a plasma moly top ring, a phosphate-treated second ring, and a chrome-treated oil ring surface, with a shallow top groove note for the listed applications. This configuration supports cylinder sealing, oil control, and consistent ring operation in compatible Chevrolet Silverado 1500 and GMC Sierra 1500 engine builds.

The catalog dimensions show a 96.00 mm bore, standard oversize, and groove sizing of 1.5 mm for the top and second ring locations, with a 3 mm first oil groove. Use 2M4978 when matching engine bore and groove specifications to the vehicle application.

What It Is Used For

• Restoring compression loss caused by worn piston rings.
• Addressing excessive oil consumption from ring wear.
• Correcting blow-by related to poor cylinder sealing.
• Replacing rings during an engine rebuild or overhaul.
• Matching bore and groove specifications in listed GM engines.

Installation Notes and Tips

Verify bore size, groove dimensions, and the shallow top groove note before installation. Clean the piston ring grooves thoroughly and confirm ring end gaps against the engine builder’s specifications. This part cross-references Sealed Power H856CP for the same application.

Quality Assurance

Use the cataloged dimensions and fitment data to confirm application match before assembly. Part number 2M4978 is listed for a broad range of GM V8 engine applications, including Chevrolet Silverado 1500 and GMC Sierra 1500 coverage.