Wiseco 4200HF High Performance Piston Ring Set 4.200 in. Bore

The Wiseco 4200HF is a high-performance replacement piston ring set engineered for a 4.200-inch bore. Sold individually to fit one piston, these rings are purpose-built to match Wiseco's exacting tolerances, ensuring optimal compression, sealing, and oil control in performance engine builds.

Wiseco offers multiple ring configurations depending on the application. The Pro Tru lineup features a plasma moly, pre-gapped ring set ideal for budget-conscious performance builds. Sport Compact kits utilize premium NPR XX rings — featuring gas-nitrided steel top rings and Napier-style second rings for superior sealing and durability. Late-model EFI applications and select small block Chevy pistons are paired with 1.2mm steel nitride and Napier GFX ring sets for precise modern engine compatibility. Many big block applications use a .043 back-cut top ring for added material thickness in the intake valve relief area.

Key Features:

• High-performance replacement ring set sized for 4.200 in. bore
• Each set fits one piston — order the quantity needed for your engine
• Available configurations include plasma moly, NPR XX steel nitrided, and 1.2mm GFX ring sets
• Napier-style second rings for enhanced oil control and sealing efficiency
• Big block variants feature .043 back-cut top ring for added strength near intake valve
• Pre-gapped for straightforward installation
• Designed and manufactured to Wiseco piston specifications for optimal fit and performance

Note: Rings are sold individually per piston. Order the specific quantity required for your engine build. Wiseco piston rings are designed to fit Wiseco pistons.