Manley 290040 SBC Rotating Assembly Stroke Bore - 383 3.750 4.040

The Manley 290040 is a high-performance rotating assembly engineered specifically for Small Block Chevy 383 stroker builds with a 3.750-inch stroke and 4.040-inch bore configuration. This complete assembly provides the foundation for building a reliable, high-horsepower engine suitable for both street and racing applications.

Key Components Include:

• Lightweight 4340 forged steel crankshaft with 3.750-inch stroke
• 4340 forged steel H-beam connecting rods with 7/16-inch ARP 8740 cap screws
• 2618 forged aluminum Platinum Series pistons designed for 4.040-inch bore
• Premium chrome moly wrist pins
• High-performance piston rings
• Clevite "H" Series narrowed rod bearings and "P" or "H" Series main bearings

Manufacturing Quality:

• Crankshaft is heat treated, stress relieved, shot peened, nitrided and 100% magnafluxed
• Micro-polished large radius journals for increased strength
• Non-twist forging process ensures structural integrity
• Horsepower rating up to 900 HP with ARP 8740 cap screws (up to 1,500 HP with optional ARP 2000 upgrade)

Important Notes:

• Assembly is typically shipped unbalanced - precision balancing recommended (order Manley P/N 04000-1 separately)
• Narrowed bearings required due to large radius journals
• Not intended for use with highly boosted roots style cog belt superchargers
• Features -15cc dish pistons for compression ratio optimization

This Manley rotating assembly combines precision manufacturing with premium materials to deliver exceptional performance and durability for demanding Small Block Chevy applications. Each component is engineered to exacting tolerances to ensure proper fit and maximum reliability under high-stress conditions.