Manley 28548HX Big Block Chevy 548ci Rotating Assembly Kit 4.250" Stroke 4.530" Bore -20cc

The Manley 28548HX is a complete Big Block Chevy rotating assembly kit built for serious high-performance and racing applications. Displacing 548 cubic inches with a 4.250-inch stroke and designed for a 4.530-inch bore, this kit delivers the foundation for a powerful BBC stroker build. The HX designation indicates the assembly includes optional HX Series main bearings with .001" extra clearance for precise bearing fitment.

Key Features:

• Engine Family: Big Block Chevrolet (BBC)
• Displacement: 548 cubic inches
• Stroke: 4.250 inches
• Bore Size: 4.530 inches
• Piston Dish: -20cc (dished piston for compression ratio tuning)
• Crankshaft Material: 4340 forged steel, non-twist forging
• Crankshaft Treatment: Heat treated, stress relieved, shot peened, nitrided, and 100% magnafluxed
• Connecting Rods: H-beam design included in assembly
• Rod Fasteners: ARP 8740 cap screws (supports up to 900 hp); upgradeable to ARP 2000 for up to 1,500 hp
• Main Bearings: HX Series with .001" extra clearance for precise fitment
• Balance: Factory balanced to within +/- 1% of bobweight
• Deck Height: Tall deck block application (4.500"–4.750" stroke kits are for tall deck blocks)

Manley rotating assemblies are engineered to deliver consistent power and durability in demanding street and race environments. The micro-polished, large-radius journals reduce friction and extend bearing life, while the comprehensive heat treatment process ensures structural integrity under extreme loads. Note: Manley crankshafts are not intended for use with highly boosted Roots-style cog belt driven superchargers.