Manley 592630C-8 Forged Pistons 4.030" Bore 2618 Alloy Flat Top 11.9:1 CR

Manley Performance forged pistons are precision-engineered for high-performance engine builds demanding maximum strength and reliability. These pistons feature a 4.030" bore diameter, 1.115" compression distance, and -4cc flat top design optimized for various compression ratios from 10.9:1 to 11.9:1 depending on combustion chamber volume. Designed for 6.125" rod length and 4.000" stroke applications, each piston weighs just 400 grams (495g with pin included).

Key Specifications:

• Bore diameter: 4.030 inches
• Compression distance: 1.115 inches
• Rod length compatibility: 6.125 inches
• Stroke compatibility: 4.000 inches
• Compression ratios: 11.9:1 @ 64cc, 11.6:1 @ 66cc, 11.1:1 @ 70cc, 10.9:1 @ 72cc
• Wrist pin diameter: .927 inches
• Piston weight: 400 grams (495g with pin)
• Piston dome: -4cc flat top

Advanced Construction Features:

• High-strength 2618 aluminum alloy forging for superior high-temperature strength and exceptional fatigue resistance
• Contour forging process provides optimal strength-to-weight ratio without grain-interrupting internal milling
• Single-fixturing manufacturing ensures perfect ring groove to skirt squareness for maximum cylinder seal and horsepower
• Proprietary multi-step top ring groove machining delivers precise groove size, geometry, flatness, and finish
• Offset wrist pin design reduces piston rock for quieter cold starts and improved performance
• Moly-coated skirts reduce friction and provide anti-scuff protection
• Federal Form-Scan gauging validates ideal skirt indexing to pinhole and skirt-to-skirt polarity

Complete Package Includes:

• Total Seal ring package: 1.5mm, 1.5mm, 3mm configuration
• Tool steel wrist pins for maximum durability
• Round wire locks included
• Pressure balance grooves machined into every piston
• Precise pinhole machining for exact compression distance and lock ring groove concentricity

Important Notes: Compression ratios are calculated at 0.00" deck clearance, 9.240" deck height, and .042" thick compressed head gasket. These pistons are designed for serious performance applications where reliability under extreme conditions is paramount.