Enginetech M37458-060 Premium Moly Piston Ring Set GM Chevy 265 305 .060 Over

The Enginetech M37458-060 is a premium moly piston ring set designed for the GM/Chevrolet 265 and 305 cubic inch small-block V8 engines bored .060" (1.524mm) oversize. This set covers all 8 cylinders and is engineered to meet or exceed original equipment specifications, making it an ideal choice for engine rebuilds and re-ring projects on these classic GM powerplants.

Key Features:

• Oversize: .060" (1.524mm) over standard bore — fits bored block at approximately 3.796" bore diameter
• Standard bore reference: 3.736" (94.89mm) — for GM/Chevy 265 and 305 V8 engines
• Ring stack: 5/64" top ring / 5/64" second ring / 3/16" oil ring
• Construction: Compression rings crafted from high-quality gray iron, ductile iron, and high-strength steel
• Face coatings: Available with plasma moly, chrome, gas nitrided, and PVD coatings depending on application
• Ring designs: Barrel face, taper face, positive twist, reverse twist, and Napier face profiles used as required
• Oil ring assemblies: Engineered with SS-50, PC-98, Wire Latch, and Flex Vent designs
• Oil ring expanders: Designed for ease of installation to prevent overlap during assembly
• Manufactured in OE facilities to ensure consistent quality and fitment

The M37458-060 is part of Enginetech's comprehensive M-series premium piston ring lineup, which is available in standard and multiple oversize options (STD, .030", .040", .060") to accommodate various rebuild scenarios. Cross-reference: replaces Federal-Mogul 454NP and other equivalent ring sets for the GM 265/305 small-block platform.