Manley 28548X BBC 548 Rotating Assembly 4.250" Stroke 4.530" Bore -20cc Platinum Series

The Manley 28548X is a complete Big Block Chevy 548 cubic inch rotating assembly built for serious high-performance and racing applications. Featuring a 4.250-inch stroke paired with a 4.530-inch bore and -20cc dish pistons, this kit delivers the displacement and component quality needed for extreme power builds. The "X" suffix designates the optional X-Series rod bearings with .001" extra clearance, ideal for engines requiring tighter bearing tolerances.

Kit Includes:

• 4340 forged steel crankshaft — heat treated, stress relieved, and precision balanced to within +/- 1% of bobweight
• 4340 forged steel H-Beam connecting rods — 6.385" center-to-center length with 7/16" ARP 8740 cap screws (ARP 2000 cap screws available as an upgrade)
• 2618 forged aluminum Platinum Series pistons — 4.530" bore (+.030" oversize), -20cc dish, with premium chrome moly wrist pins
• Total Seal piston rings
• Clevite "H" Series narrowed rod bearings (X-Series, +.001" extra clearance) and "P" or "H" Series main engine bearings

Horsepower Capability:

• Up to 900 HP with standard ARP 8740 cap screws
• Up to 1,500 HP with optional ARP 2000 cap screws

This assembly is designed for standard deck Big Block Chevy blocks with a 2-piece rear main seal. All components are system-matched for proper fitment and optimized performance, making this an ideal foundation for a high-displacement, high-horsepower BBC build.