The JE Pistons 321240 forged flat top piston set is engineered for GM LS1 engines and uses 2618 aluminum with a round-forged construction for maximum strength, skirt stability, and consistent ring control in high-performance applications. Each piston is forged and machined in the USA and designed for LS Gen III architecture and performance-oriented compression targets.

JE Pistons 321240 Includes:

• Forged pistons (set of 8)
• Wrist pins
• Pin locks

JE Pistons 321240 Features:

• Flat top crown design for GM LS1 and LS Gen III cylinder head configurations
• Forged 2618 aluminum construction for high strength and durability
• Round forging with optimized skirt width for reduced friction and increased stability
• Proprietary FSR (Forged Side Relief) forging reduces mass and minimizes power loss
• Skirt coating reduces friction and skirt wear while improving lubrication
• Accumulator groove reduces combustion gas pressure behind the rings to stabilize sealing
• 3.905 in. bore diameter for LS1 and LS Gen III blocks
• 1.340 in. compression height for common LS rotating assemblies
• -2.00 cc dish volume tuned for performance compression ratios
• Engineered and machined in the USA
• Ring set not included

JE Pistons 321240 Notes:

• Compatible ring dimensions: 0.060 in. top, 0.060 in. second, 0.1175 in. oil
• Wrist pin: 0.945 in. diameter, 2.250 in. length, 0.150 in. wall thickness