Manley 290735X SBC Rotating Assembly Stroke Bore X-Series Bearings - 355 3.480 4.035

The Manley 290735X is a complete Small Block Chevy (SBC) 355 cubic inch rotating assembly built around a 3.480-inch stroke and 4.035-inch bore. The "X" suffix designates inclusion of Manley's optional X-Series rod bearings, which feature .001" extra clearance for high-performance and racing applications that benefit from additional oil film thickness.

This rotating assembly is anchored by a 4340 forged steel crankshaft that is heat treated, stress relieved, shot peened, nitrided, and 100% magnafluxed for uncompromising strength and reliability. The crank features micro-polished large-radius journals for reduced friction and improved bearing life.

Key Features:

• Small Block Chevy (SBC) rotating assembly — 355 CID
• 3.480" stroke crankshaft with 4.035" bore specification
• X-Series rod bearings included — .001" extra oil clearance for racing applications
• Pro Series Lightweight I-Beam connecting rods with 7/16" ARP 2000 cap screws
• 4340 forged crankshaft — heat treated, stress relieved, shot peened, nitrided, and 100% magnafluxed
• Micro-polished large-radius journals (narrowed rod bearings required)
• High-performance piston rings included
• Clevite H-Series narrowed rod bearings and P- or H-Series main bearings
• Horsepower range up to 900 HP with ARP 8740 hardware; up to 1,500 HP with optional ARP 2000 cap screws
• Unbalanced assembly — order Manley P/N 04000-1 separately for precision balancing

Designed for serious street and racing builds, the Manley 290735X delivers the precision-engineered bottom-end foundation needed to support aggressive power levels. For a precision-balanced assembly, order Manley balancing service part number 04000-1 separately.