Manley 28548RH BBC Rotating Assembly Stroke Bore - 548ci 4.250 4.530 20cc

The Manley 28548RH is a complete forged rotating assembly engineered for Chevrolet Big Block (BBC) applications, displacing 548 cubic inches with a 4.250" stroke and a 4.530" bore size (+.030" over). Designed for high-output street, strip, and race builds, this assembly delivers everything needed to build a bulletproof BBC bottom end in one matched kit.

Key Features:

• 4340 Forged Steel Crankshaft – Lightweight 4.250" stroke crank sized to 454 main journals, designed for internal balance
• 4340 Forged H-Beam Connecting Rods – 6.385" length with 7/16" ARP 8740 cap screws standard; optional ARP 2000 cap screws available for extreme power levels
• 2618 Forged Aluminum Platinum Series Pistons – -20cc dish design at 4.530" bore, fitted with Premium Chrome Moly wrist pins
• High Performance Piston Rings Included
• Clevite® "H" Series Rod Bearings (narrowed) and "P" or "H" Series main engine bearings included
• Horsepower range up to 900 HP with ARP 8740 cap screws; up to 1,500 HP with optional ARP 2000 cap screws
• Factory balanced to within +/- 1% of bobweight

Additional Upgrade Options:

• Add suffix "X" to the part number to upgrade to optional ARP 2000 cap screws
• Add suffix "X" for optional "X" Series rod bearings with .001" extra clearance
• Add suffix "HX" for optional "HX" Series main bearings with .001" extra clearance

Manley's BBC rotating assemblies are system-matched components precision-engineered to work together from day one, eliminating the guesswork of sourcing individual parts. Note: Manley 4340 forged crankshafts are not intended for use with highly boosted roots-style cog belt superchargers.