Manley 38555R Big Block Chevy Rotating Assembly Stroke Bore Flat Top - 555ci Kit 4.250 4.560 3cc

The Manley 38555R is a complete rotating assembly kit engineered for Big Block Chevy (BBC) engines, delivering a 555 cubic inch displacement with a 4.250-inch stroke and 4.560-inch bore using -3cc flat-top pistons. Designed for serious street and competition builds, this internally balanced kit combines precision-matched, race-proven components to maximize power output and long-term durability.

Kit Includes:

• 4340 Forged Steel Crankshaft — Lightweight design, 4.250" stroke; heat treated, stress relieved, shot peened, nitrided, and 100% Magnafluxed
• 4340 Forged Steel H-Beam Connecting Rods — 6.385" length with ARP cap screws; heat treated, stress relieved, shot peened, nitrided, and 100% Magnafluxed
• 2618 Forged Aluminum Platinum Series Pistons — 4.560" bore, -3cc flat-top design, 1.395" compression height; paired with premium chromoly wrist pins
• Total Seal Piston Rings — 1/16"-1/16"-3/16" configuration
• Clevite "H" Series Rod Bearings (narrowed) and main bearings

Key Features:

• Internally precision balanced by Manley in-house for seamless installation
• Rated at 900 hp with standard ARP 8740 rod bolts; upgradeable to 1,500 hp with optional ARP 2000 cap screws
• Compatible with 9.800" deck height Big Block Chevy blocks
• Flat-top piston design with -3cc volume supports a wide range of compression ratios depending on combustion chamber size
• All critical rotating components undergo heat treatment, stress relief, shot peening, nitriding, and 100% Magnaflux inspection

The Manley 38555R rotating assembly kit is built to handle the extreme demands of high-performance street machines and race engines alike. Every component is system-matched and precision balanced to deliver reliable power and consistent performance right out of the box.