Wiseco 4165H Piston Ring Set 4.165 in. Bore 1/16 x 1/16 x 3/16

The Wiseco 4165H is a high-performance replacement piston ring set designed for a 4.165-inch bore diameter with a standard 1/16 x 1/16 x 3/16 ring thickness configuration. Each set fits one piston and is engineered to Wiseco's exacting specifications to deliver superior sealing, reduced friction, and optimal oil control in high-performance automotive applications.

Wiseco offers multiple ring technologies across their automotive lineup to match different performance levels and budgets:

• Pro Tru Series: Features plasma moly pre-gapped rings, ideal for budget-conscious builders seeking reliable performance
• Sport Compact Series: Utilizes premium NPR XX rings, including high-quality steel nitrided top rings and Napier-style second rings for enhanced sealing
• Late Model EFI & Small Block Chevy: Engineered around 1.2mm Steel Nitride and Napier GFX ring sets for modern fuel-injected applications
• Big Block Applications: Many sets feature a .043 back-cut top ring for extra material thickness around the intake valve

Key Features:

• Ring set fits one piston — order the quantity needed for your application
• Designed and tested for race-ready performance
• Precision-engineered to maintain size and geometry for exceptional ring seal
• Provides sustained peak performance in both street and race applications
• Compatible with Wiseco pistons only — Wiseco rings are not interchangeable with other brands

Wiseco piston ring sets are made specifically to Wiseco's tolerances to ensure optimal compression, sealing, and oil control. Each ring set is sold individually — order one set per piston cylinder.