Enginetech M39458-040 Piston Ring Set GM Chevy CID Oversize - 6.0L 366 0.040

The Enginetech M39458-040 is a moly-faced piston ring set engineered for GM/Chevrolet 6.0L (366 CID) engines bored 0.040" oversize. Designed for professional engine rebuilders and experienced enthusiasts, this oversize ring set restores proper cylinder sealing, compression, and oil control in worn or rebuilt engines.

Enginetech ring sets are manufactured to meet or exceed original equipment specifications, ensuring reliable performance and long service life when installed in a properly prepared engine.

Key Features:

• Application: GM/Chevrolet 6.0L (366 CID) engines
• Oversize: 0.040" (1.0mm) overbore
• Ring Style: Moly-faced top compression ring for enhanced wear resistance and break-in
• Design: Three-piece ring set per piston — top compression, second compression, and oil control ring
• Manufacturer: Enginetech — a trusted name in engine rebuild components
• OEM-equivalent specifications for proper fit and function

Enginetech M39458-040 piston rings are ideal for full engine rebuilds where cylinders have been bored 0.040" over standard. Always verify bore diameter and ring gap before installation per manufacturer guidelines.