Manley 28555H BBC 555 Rotating Assembly Kit 4.250 Stroke 4.560 Bore -3cc Flat Top

The Manley 28555H is a complete Big Block Chevy 555 cubic inch rotating assembly kit engineered for serious street and race engine builds. This kit combines a 4.250" stroke with a 4.560" bore and features -3cc flat-top forged pistons, delivering an ideal compression-ready platform for high-output BBC applications.

Key Features:

• Displacement: 555 cubic inches (BBC)
• Stroke: 4.250 inches
• Bore: 4.560 inches
• Piston Design: -3cc flat-top forged pistons for near-zero deck compression tuning
• Connecting Rods: Forged 4340 steel H-Beam connecting rods with ARP cap screws
• Crankshaft: Forged 4340 steel crankshaft — heat treated, stress relieved, shot peened, nitrided, and 100% magnafluxed
• Bearings: High-performance Clevite® "H" Series rod and main bearings included
• Rings: High-performance piston rings included
• Balance: Factory balanced to within +/- 1% of bobweight
• Rated for up to 900 HP with ARP 8740 cap screws; up to 1,500 HP with optional ARP 2000 cap screws

Important Notes:

• Designed for standard deck Big Block Chevy blocks (4.000"–4.375" stroke kits are for standard deck)
• Not intended for use with highly boosted roots-style cog belt superchargers
• Add suffix "X" to order optional "X" Series rod bearings with .001" extra clearance
• Add suffix "HX" to order optional "HX" Series main bearings with .001" extra clearance

Manley Performance has been a trusted name in high-performance engine components since 1966, and this rotating assembly kit delivers the precision engineering and material quality that professional engine builders demand. Whether building a dedicated race engine or a high-output street/strip powerplant, the 28555H provides a solid, balanced foundation for your BBC 555 build.