Manley 38555HX BBC CID Rotating Assembly Stroke Bore Flat Top - 555 4.250 4.560 3cc

The Manley 38555HX is a complete Big Block Chevy (BBC) 555 cubic inch rotating assembly built for serious street and race engine builds. Featuring a 4.250-inch stroke and 4.560-inch bore with -3cc flat-top pistons, this kit delivers the displacement and components needed to produce exceptional horsepower and torque from a standard deck Big Block Chevy platform.

What's Included:

• 4340 forged steel crankshaft — heat treated, stress relieved, shot peened, nitrided, and 100% magnafluxed with micro-polished large-radius journals
• 4340 forged steel H-Beam connecting rods with 7/16" ARP 8740 cap screws (ARP 2000 cap screws optional)
• 2618 forged aluminum Platinum Series pistons — -3cc flat-top design with premium chrome moly wrist pins
• Total Seal piston rings — high-performance specification
• Clevite "H" Series narrowed rod bearings and "P" or "H" Series main engine bearings

Key Specifications:

• Displacement: 555 cubic inches
• Stroke: 4.250 in.
• Bore: 4.560 in.
• Piston Head Volume: -3cc (flat top)
• Horsepower Rating: up to 900 HP with ARP 8740 rod bolts; up to 1,500 HP with optional ARP 2000 cap screws
• Balance: Factory balanced to within +/- 1% of bobweight
• Application: Standard deck Big Block Chevy (4.000"–4.375" stroke kits are for standard deck blocks)
• "HX" suffix denotes optional Clevite HX Series main bearings with .001" extra clearance

The Manley 38555HX rotating assembly is factory balanced and engineered to integrate seamlessly into a BBC engine build. Whether destined for bracket racing, street/strip duty, or a high-output naturally aspirated combination, this kit provides the forged strength and precision fitment that demanding builds require.