CP-Carrillo XP5023-6 X-Series Forged Piston Set Porsche 3.8L 964/993 102mm 12.5:1

Featuring a 102mm bore, 76.4mm stroke, and a high 12.5:1 compression ratio, this piston set is purpose-built for naturally aspirated high-performance and racing engine rebuilds.

Key Features:

• Material: Forged from high-strength 2618 aluminum alloy for superior thermal fatigue resistance and durability under extreme conditions
• Full 3D Under-Crown Milling: Typically reserved for custom pistons, this feature is standard on the X-Series to minimize reciprocating mass and maximize engine response
• Narrow Pin Boss Forging: Reduces weight while maintaining structural integrity
• Anti-Detonation & Accumulator Grooves: Engineered to manage ring seal and heat under high-compression operation
• Double Pin Oil with Broach: Enhances wrist pin lubrication for longevity at high RPM
• Wire Lox Retention System: Includes CP's proprietary wire lox clips and installation tool for secure pin retention
• CPN Ring Set Included: Each piston ships with a modern CPN ring package consisting of a gas nitride top ring, Napier-cut second ring, and 3-piece oil control ring — designed for use with Nikasil-bored cylinders
• Heavy-Duty Wrist Pins: 23mm diameter pins rated for high-load performance use
• Rod Center-to-Center: 127mm (5.000 in.)

Each piston is precision-machined to exacting tolerances at CP-Carrillo's manufacturing facility in Irvine, California. The X-Series shelf program for aircooled Porsche engines covers bore sizes from 95mm to 102mm across multiple compression ratios, making it a trusted choice among professional Porsche engine builders worldwide.