Manley 38548HX BBC 548ci Rotating Assembly 4.250" Stroke 4.530" Bore -20cc HX Bearings

The Manley 38548HX is a complete Big Block Chevy (BBC) 548 cubic inch rotating assembly engineered for high-performance and race applications. Built around a 4.250" stroke and 4.530" bore with -20cc dish pistons, this kit delivers everything needed to assemble a powerful, well-matched rotating assembly. The "HX" designation indicates the inclusion of optional Clevite HX Series main bearings with .001" extra clearance for enhanced bearing life under demanding conditions.

What's Included:

• 4340 forged steel crankshaft — 4.250" stroke, lightweight design with 454 main journal sizing, engineered for internal balance
• 4340 forged steel H-Beam connecting rods — 6.385" length with 7/16" ARP 8740 cap screws (ARP 2000 cap screws available as an option)
• 2618 forged aluminum Platinum Series pistons — -20cc dish, 4.530" bore, with premium Chrome Moly wrist pins
• Total Seal piston rings
• Clevite HX Series main bearings with .001" extra clearance
• Clevite H Series narrowed rod bearings

Key Features:

• Crankshaft is heat treated, stress relieved, shot peened, nitrided, and 100% magnafluxed for maximum structural integrity
• Micro polished large radius journals for improved oil film retention (narrowed rod bearings required)
• Factory balanced to within +/- 1% of bobweight
• Horsepower rated to 900 hp with ARP 8740 cap screws; up to 1,500 hp with optional ARP 2000 cap screws
• Not intended for use with highly boosted Roots-style cog belt driven superchargers

The Manley 38548HX rotating assembly is an ideal foundation for a serious BBC stroker build, providing precision-matched components that work together for optimal balance, durability, and power output straight out of the box.