Manley 290130X SBC Stroker Rotating Assembly Stroke Bore Flat Piston - 383 3.750 4.030 4cc

The Manley 290130X is a complete 383 cubic inch Small Block Chevy stroker rotating assembly built around a 3.750" stroke and a 4.030" bore with -4cc flat-top pistons. The "X" suffix designates that this kit is supplied with optional "X" Series rod bearings featuring .001" extra clearance, ideal for engine builders who prefer slightly looser tolerances for high-performance or forced-induction applications.

Every component in this assembly is engineered to Manley's exacting standards, combining a lightweight forged crankshaft, premium connecting rods, and race-proven pistons into a single matched package capable of supporting serious power levels.

Kit Includes:

• Lightweight 4340 forged steel crankshaft — heat treated, stress relieved, shot peened, nitrided, and 100% magnafluxed with micro-polished large-radius journals
• 4340 forged steel H-Beam connecting rods, 6.000" center-to-center length, with 7/16" ARP 8740 cap screws (ARP 2000 cap screws optional)
• 2618 forged aluminum Platinum Series pistons, 4.030" bore, -4cc flat-top, 1.125" compression height
• Premium chrome moly wrist pins
• Total Seal high-performance piston rings — 1/16" – 1/16" – 3/16"
• Clevite "H" Series rod bearings (narrowed) and "P" Series main bearings — "X" Series with .001" extra clearance

Key Specifications:

• Engine Displacement: 383 CID (Small Block Chevy)
• Stroke: 3.750"
• Bore: 4.030" (0.030" oversize)
• Connecting Rod Length: 6.000" (center-to-center)
• Piston: -4cc flat-top, 2618 forged aluminum
• Horsepower Rating: Up to 750 HP with ARP 8740 cap screws; up to 1,500 HP with optional ARP 2000 cap screws

The 290130X delivers the combination of quality materials, in-house precision manufacturing, and race-level horsepower capacity that has made Manley Performance rotating assemblies a trusted choice for professional engine builders since 1966.