Manley Subaru EJ257 99.75mm +.25mm Bore 8.5:1 Dish Platinum Series Piston Set with Rings

If you're rebuilding the engine in your Subaru EJ257, this Manley Performance Platinum Series piston set is a solid choice for serious performance. These pistons are specifically sized for a 99.75mm bore, which is a +.25mm overbore from stock, and feature an 8.5:1 compression ratio dish. Manley is a well-known name among engine builders, and this set is designed to handle the demands of a performance build.

What sets these pistons apart is the material and construction. They're forged from domestic 2618 alloy, which offers superior strength and durability compared to cast pistons. You also get tool steel wrist pins, which are strong and reliable for high-stress applications. Manley pays close attention to the details, like the exacting standards for ring lands and grooves to ensure a good seal, and their unique skirt profiles that help generate power while being gentler on your cylinder walls. Machining these critical areas in a single operation also ensures the ring grooves are perfectly square to the piston skirt, which is important for proper ring function.

This set includes the pistons, rings, and wrist pins needed to get your EJ257 engine back together. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper assembly and break-in procedures.