Wiseco 6559M865 Pro Tru Sport Compact Forged Piston 86.5mm Bore

The Wiseco 6559M865 is a Pro Tru Sport Compact Series replacement forged piston with an 86.5mm bore, designed for performance street and competition sport compact engine builds. Manufactured entirely in the USA by skilled craftsmen at Wiseco's Ohio facility using state-of-the-art forging presses and CNC machinery, this piston delivers race-proven durability and precision in a single replacement unit.

Wiseco's Sport Compact Pro Tru line uses dedicated forgings specific to the final piston shape, resulting in a piston that is both stronger and lighter than conventional industry-standard designs. The use of application-specific forgings minimizes excess material while maximizing structural integrity under high-stress conditions.

Key Features:

• 86.5mm bore diameter — precision-machined to tight tolerances
• Pro Tru Sport Compact Series — engineered for sophisticated sport compact engines
• Includes rings and wrist pin — complete, ready-to-install piston assembly
• .200" wall tool steel wrist pin — high-strength pin for demanding applications
• Plasma moly ring package included — 1/16", 1/16", 3/16" pre-gapped rings for excellent seal, friction reduction, and long service life
• Replacement/individual piston — sold as a single piston for selective replacement
• Forged and CNC-machined in the USA — Ohio-built with race-winning heritage
• Multiple compression ratio volumes available — allows engine builders to dial in exact compression ratio
• Recommended ring set: 8650XX

Wiseco's Sport Compact Pro Tru pistons represent outstanding value in the forged piston market, combining American craftsmanship, race-derived engineering, and broad compression ratio availability for naturally aspirated and forced-induction sport compact builds.