BBTV 668 Engine Piston Ring

Engine Piston Ring for GM V8 Applications

This engine piston ring set is built for a wide range of Chevrolet and GMC truck and utility applications with a 3.875-inch bore and standard oversize. Part number 668 is specified with phosphate-treated top and second rings, plus a chrome-treated first oil ring for controlled wear characteristics.

Key Features

• Standard oversize configuration for matching the listed engine bore.
• Grey iron top ring and second ring for proven sealing performance.
• Phosphate surface treatment on the top and second rings.
• Steel rail and stainless expander first oil ring with chrome surface treatment.
• Fits many Chevrolet and GMC truck, van, and Suburban engine applications.

Detailed Description

Part number 668 is an engine piston ring set for 6-cylinder engine applications with a 3.875-inch bore. The ring package uses a grey iron top ring and second ring, with phosphate surface treatment on both compression rings to support consistent cylinder sealing and wear control. The first oil groove uses a steel rail and stainless expander design with a chrome surface treatment for oil control. This part cross-references Monroe Shocks & Struts (e.g., 909P, 980P) for the same application.

Compatible with Chevrolet and GMC platforms including C10 Pickup, K20 Pickup, Blazer, Suburban, and related truck and van models. Part number 668 is also listed across multiple GMC and Chevrolet heavy-duty and utility applications from the 1960s through the 1980s, making it a direct match for many vintage GM engine rebuilds.

What It Is Used For

• Restoring compression sealing in worn cylinder bores.
• Reducing oil consumption caused by ring wear.
• Addressing blow-by from tired piston ring sets.
• Supporting rebuilds on older Chevrolet and GMC engines.
• Replacing rings with incorrect bore or groove dimensions.

Installation Notes and Tips

Verify bore size, groove widths, and ring end gap before installation. Confirm the engine application against the listed fitment for Chevrolet and GMC models, including C10 Pickup, K20 Pickup, and related truck platforms. Clean piston ring grooves thoroughly and follow standard engine assembly procedures for ring orientation and gap placement.

Quality Assurance

This part is cataloged with OE-style dimensional and material specifications for the listed applications. Part number 668 is referenced across multiple interchange numbers, including 909P and 980P, for the same engine family.