Wiseco 6566M81 Pro Tru Sport Compact Forged Replacement Piston

The Wiseco 6566M81 is a Pro Tru Sport Compact Series forged replacement piston, engineered for performance-driven builds demanding strength, precision, and reliability. Wiseco draws on decades of race-winning piston development to deliver exceptional value in the Sport Compact forged piston segment.

American-Made Forged Construction:

Manufactured in Ohio by skilled craftsmen using state-of-the-art forging presses and CNC machining, the Pro Tru line uses dedicated forgings specific to each final piston shape. This process results in a piston that is both stronger and lighter than industry-standard alternatives — a direct benefit of purpose-built forgings rather than generic blanks.

Key Features:

• Forged and CNC-machined in the USA for superior strength-to-weight ratio
• Dedicated forgings matched to final piston geometry for optimal performance
• Includes plasma moly ring package — pre-gapped 1/16", 1/16", 3/16" configuration
• Plasma moly rings provide excellent combustion seal, reduced friction, and extended service life
• Available in multiple compression volume options to achieve target compression ratios
• Rings and wrist pins included
• Recommended ring set: 8100XX

The Wiseco Pro Tru 6566M81 piston is an ideal choice for Sport Compact engine builders seeking a high-quality forged piston with a complete ring and pin package, ready to drop into a precision build.