Manley 290840H SBC 355 Rotating Assembly Kit 3.480" Stroke 4.040" Bore -4cc Flat Top

The Manley 290840H is a complete rotating assembly kit engineered for Small Block Chevrolet (SBC) 355 cubic inch builds. Featuring a 3.480" stroke and 4.040" bore with -4cc flat top pistons, this assembly delivers the balanced combination of strength, precision, and high-horsepower capability that Manley Performance is known for.

At the core of this rotating assembly is a lightweight 4340 forged steel crankshaft, paired with Pro Series Lightweight I-Beam connecting rods secured with 7/16" ARP 2000 cap screws — capable of supporting up to 1,500 horsepower. The kit also includes 2618 alloy Platinum Series forged aluminum pistons with premium Chrome Moly wrist pins, delivering outstanding durability under extreme heat and pressure.

Kit Highlights:

• Engine Type: Small Block Chevrolet (SBC)
• Displacement: 355 cubic inches
• Stroke: 3.480"
• Bore: 4.040"
• Piston Style: -4cc Flat Top
• Crankshaft: Lightweight 4340 forged steel
• Connecting Rods: Pro Series Lightweight I-Beam with 7/16" ARP 2000 cap screws
• Pistons: 2618 alloy Platinum Series forged aluminum
• Wrist Pins: Premium Chrome Moly
• Piston Rings: Total Seal included
• Bearings: Clevite "H" Series narrowed rod bearings and "P" or "H" Series main engine bearings
• Horsepower Rating: Up to 1,500 hp with ARP 2000 cap screws