Manley 39555HX BBC Rotating Assembly Stroke Bore Dome - 555 4.250 4.560 43cc

The Manley 39555HX is a complete Big Block Chevy 555 cubic inch rotating assembly built for serious street and competition engine builds. This kit is engineered around a 4.250-inch stroke crankshaft paired with a 4.560-inch bore and +43cc dome pistons, delivering the displacement and compression foundation needed for high-output BBC applications.

Key Specifications:

• Engine Family: Big Block Chevrolet (BBC)
• Displacement: ~555 Cubic Inches
• Crankshaft Stroke: 4.250 inches
• Bore Diameter: 4.560 inches
• Piston Dome: +43cc dome
• Connecting Rods: H-beam forged steel design (HX designation)
• Construction: Forged 4340 steel crankshaft and rods for maximum strength

Why Choose the Manley 39555HX?

• Precision-matched components engineered to work together as a system
• Forged construction throughout for durability under high-stress race and street conditions
• Optimized for Big Block Chevy blocks requiring a 4.250-inch stroke
• +43cc dome pistons provide a high compression ratio for maximum power output
• H-beam rod configuration offers excellent strength-to-weight characteristics

Manley Performance is a trusted name in high-performance engine components, producing rotating assemblies to exacting tolerances for both professional racing and demanding street builds. The 39555HX rotating assembly provides a solid foundation for anyone building a 555 BBC powerplant.