TOMEI Forged Piston Set (86.00mm bore, 31.65mm Compression Height) Compatible with Mitsubishi 4G63 (Evo 1-9) - For 2.2L / 2.3L Stroker Builds

Build a robust foundation for your high-performance 4G63 with this TOMEI Forged Piston Set. Designed specifically for Lancer Evolution models 1 through 9, these pistons are engineered to withstand the extreme combustion pressures of tuned turbocharged engines. With an 86.00mm bore size and 31.65mm compression height, this set is ideally suited for 2.2L and 2.3L stroker engine builds, providing the increased displacement and strength required for serious power levels. Manufactured using a high-strength forging process rather than a standard casting method, these pistons offer superior high-temperature strength. This allows for a thinner, lighter wall construction without compromising durability, reducing reciprocating mass for improved engine response and high-RPM capability. Each piston features a precision 3D profile (oval barrel shape) engineered with calculated thermal expansion coefficients to maintain optimal cylinder clearance throughout the operating temperature range.

• Stroker-Specific 4G63 Pistons: Forged pistons with 86.00mm bore and 31.65mm compression height, specifically designed for 2.2L and 2.3L stroker engine builds using the 4G63 (Evo 1-9).
• High-Strength Forged Construction: Manufactured using a premium forging process for superior high-temperature strength, allowing for lighter, thinner walls and reduced reciprocating mass.
• Precision 3D Profile Design: Features an oval barrel shape with engineered thermal expansion coefficients to maintain optimal cylinder clearance and smooth piston operation.
• Performance-Oriented Features: Includes recesses for 1mm oversized valves and is designed for thin piston rings to reduce friction and improve high-RPM performance.
• Complete Matched Kit: Supplied as a comprehensive set including pistons, pins, clips, and rings, ensuring all components are perfectly matched for reliable assembly.