Manley 46132ST-8 Engine Piston Ring Set 4.090" Bore Premium Steel Top File Fit

The Manley 46132ST-8 is a Premium Steel Top Ring set designed for a 4.090-inch bore, featuring a 1.2mm top ring, 1.2mm second ring, and 2.5mm oil ring. Premium Steel top ring sets are engineered specifically for high-horsepower, forced induction, and nitrous oxide applications where a conventional ductile iron top ring may not hold up under extreme cylinder pressures. This is a file fit set, allowing builders to precision-fit ring end gaps to their specific application requirements.

Key Features:

• Premium Steel top ring — ideal for forced induction, nitrous, and high-horsepower engine builds
• Bore diameter: 4.090 inches
• Ring widths: 1.2mm top, 1.2mm second, 2.5mm oil
• Oil ring tension: 8–12
• File fit installation type for precise end-gap tuning
• Napier-style second ring standard on all Premium Steel ring sets
• Manley also offers conventional ductile iron sets with plasma-moly inlay top rings, as well as Total Seal® Gapless® top ring packages for compatible piston applications

Manley Performance piston rings are meticulously engineered to deliver a reliable, durable cylinder seal across a wide range of engine builds. The Premium Steel top ring construction makes this set a go-to choice for performance engine builders pushing the limits of boost, nitrous, or high-rpm power.