Manley 38548R BBC Rotating Assembly Stroke Bore Dish - 548ci 4.250 4.530 20cc

The Manley 38548R is a complete Big Block Chevy (BBC) rotating assembly engineered for high-displacement, high-horsepower 548 cubic inch builds. Featuring a 4.250" stroke paired with a 4.530" bore and -20cc dish pistons, this internally balanced kit delivers everything needed for a serious performance engine foundation.

The crankshaft is a lightweight 4340 forged steel unit sized for standard 454 main journals and designed for internal balance. It undergoes an extensive manufacturing process including heat treating, stress relieving, shot peening, nitriding, and 100% magnaflux inspection to ensure complete structural integrity and long-term durability. The assembly is factory balanced to within +/- 1% of bobweight.

Kit Includes:

• 4340 Forged Steel Crankshaft — 4.250" stroke, 454 main size, internal balance, 6.385" rod journal center-to-center
• 4340 Forged Steel H-Beam Connecting Rods — 6.385" length, 7/16" ARP 8740 cap screws standard (ARP 2000 optional)
• 2618 Forged Aluminum Platinum Series Pistons — 4.530" bore (+.030" oversize), -20cc dish, with premium chrome moly wrist pins
• Total Seal Piston Rings — High-performance ring set matched to 4.530" bore
• Clevite Bearings — "H" Series narrowed rod bearings and "P" or "H" Series main engine bearings

Horsepower Capability: Rated for 900 hp with standard ARP 8740 cap screws. Upgrade to optional ARP 2000 cap screws for ratings up to 1,500 hp.

The Manley 38548R is ideal for street/strip and competition builds requiring a proven, complete rotating assembly in a single kit. The 2-piece rear main seal design is compatible with standard BBC block configurations. Note: Not intended for use with highly boosted Roots-style cog belt driven superchargers.