BBTV 4742 Engine Piston Ring

Engine Piston Ring Overview

Engine piston ring 4742 is a standard-size ring set application for select Chevrolet and GMC V8 engines with a 3.736-inch bore. It is built around grey iron top and second rings, with a steel rail and stainless expander for the oil ring package.

Fits 1993-2002 Chevrolet and GMC applications listed below, with shallow oil groove configuration and phosphate-treated top and second rings for controlled wear characteristics.

Key Features

• Part number 4742 for standard bore service applications
• 3.736-inch bore size, or 94.89 mm metric equivalent
• Grey iron top ring and second ring construction
• Steel rail and stainless expander oil ring design
• Phosphate surface treatment on the top and second rings
• Shallow oil groove configuration noted in the fitment data

Detailed Description

Part number 4742 is an engine piston ring set application for Chevrolet and GMC trucks, vans, and full-size passenger vehicles listed in the fitment data. The ring package uses grey iron for the top and second rings, with phosphate surface treatment to support consistent break-in behavior, while the oil ring uses a steel rail and stainless expander with chrome treatment on the rail surface. This configuration is specified for engines with a 3.736-inch bore and standard oversize.

Fits 1993-1999 Chevrolet C1500, N/A; 1993-1999 Chevrolet K1500, N/A; 1993-1998 Chevrolet C2500, N/A; 1993-1998 Chevrolet K2500, N/A; 1993-1995 Chevrolet G10, N/A; 1993-1995 Chevrolet G20, N/A; 1993 GMC Caprice, N/A; 1996-2002 Chevrolet Express 1500, N/A; 1996-2002 Chevrolet Express 2500, N/A; 1996-2002 GMC Savana 1500, N/A; 1996-2002 GMC Savana 2500, N/A; 1993-1999 GMC C1500, N/A; 1993-1999 GMC C2500, N/A; 1993-1999 GMC K1500, N/A; 1993-1995 GMC G1500, N/A; 1993-1995 GMC G2500, N/A; 1993-1995 GMC K2500, N/A.

What It Is Used For

• Restoring cylinder sealing in worn engine assemblies
• Reducing oil control issues related to ring wear
• Addressing compression loss from tired piston rings
• Supporting rebuilds that require standard bore ring dimensions
• Replacing rings in engines with shallow oil groove pistons

Installation Notes and Tips

Verify bore size, groove dimensions, and piston configuration before installation. Confirm the engine matches the listed 3.736-inch bore specification and shallow oil groove note. Clean ring lands thoroughly and follow the engine builder’s ring gap and break-in procedures for the application.

Quality Assurance

Part number 4742 is specified with material and surface-treatment details that support consistent engine rebuild service. Use the fitment data and bore specification to confirm application before assembly.