Manley 39555HXX Big Block Chevy Rotating Assembly Stroke Bore Dome - 555 4.250 4.560 43cc

The Manley 39555HXX is a complete Big Block Chevy 555 cubic inch rotating assembly engineered for serious high-performance street and race engine builds. Featuring a 4.250-inch stroke and 4.560-inch bore with +43cc dome pistons, this all-forged rotating assembly delivers the displacement and durability needed for demanding power adder and naturally aspirated applications.

Key Features:

• 4340 Forged Steel Crankshaft — 4.250-inch stroke, lightweight design built for strength and reliability under extreme loads
• 4340 Forged Steel H-Beam Connecting Rods — 6.385-inch length with 7/16" ARP 2000 cap screws, rated for up to 1,500 horsepower
• 2618 Forged Aluminum Platinum Series Pistons — +43cc dome profile with premium chrome moly wrist pins for superior heat and stress resistance
• Total Seal Piston Rings included for optimal ring seal and performance
• Clevite "H" Series Rod Bearings (narrowed) and "P" Series Main Bearings included for a complete assembly
• Displaces 555 cubic inches (4.560" bore x 4.250" stroke)
• Horsepower capability up to 1,500 hp with ARP 2000 cap screws

• 4340 forged steel crankshaft
• Piston rings
• Clevite rod and main bearings

Manley Performance rotating assemblies are precision-matched components designed to work together from the first startup. Each assembly is built to meet the rigorous demands of both street performance and full competition racing applications, making the 39555HXX an ideal foundation for a high-displacement BBC build.