NPR 10-910-2 Piston Set with Rings Subaru 2.5L DOHC EJ255 +0.50mm Oversize

The NPR 10-910-2 is a premium oversize piston set with rings engineered for the Subaru 2.5L DOHC EJ255 engine. This set is sized at +0.50mm oversize and is designed for use during engine rebuilds where the cylinder bores have been machined beyond standard dimensions.

Manufactured by NPR of America, Inc. (Nippon Piston Ring), a wholly owned subsidiary of Nippon Piston Ring Co., Ltd. established in 1973, these pistons and rings are produced to meet or exceed original equipment manufacturer specifications. NPR has supplied OEM customers and the automotive aftermarket with precision engine components for decades.

Key Features:

• Premium-grade aluminum alloy piston construction
• +0.50mm oversize for use with bored/honed cylinders
• Moly skirt coating reduces friction and minimizes cylinder wall wear
• Includes compression rings and oil control ring set per cylinder
• Engineered to minimize blow-by and reduce oil consumption
• Designed to OEM tolerances for proper fit and long service life
• Manufactured to JIS (Japanese Industrial Standard) B8032-6-1998

NPR piston rings utilize advanced surface treatment technology and steel ring designs that conform more effectively to cylinder bore surfaces. Steel construction provides higher tensile strength, greater fatigue life, reduced ring side wear, and superior oil economy compared to cast iron alternatives. This piston kit is ideal for performance rebuilds and high-mileage engine restorations requiring cylinder boring.