Manley 290930RX SBC Rotating Assembly Stroke Bore Seal - 383ci 3.750 4.030 2-Piece

The Manley 290930RX is a complete rotating assembly kit for the Small Block Chevrolet (SBC) 383ci stroker application, built around a 3.750-inch stroke crankshaft and 4.030-inch bore (0.030 over) forged pistons. Designed for the 2-piece rear main seal block, this kit delivers the precision-engineered internals needed to build a reliable, high-output 383 stroker engine.

Kit Includes:

• Manley 4340 forged steel crankshaft — 3.750-inch stroke, 350 main journal, lightweight design; heat treated, stress relieved, shot peened, nitrided, and 100% Magnafluxed
• Manley 4340 forged steel H-beam connecting rods — 6.000-inch length, fitted with 7/16-inch ARP cap screws; heat treated, stress relieved, shot peened, and 100% Magnafluxed
• Manley 2618 forged aluminum Platinum Series pistons — 4.030-inch bore with premium chromoly wrist pins
• Total Seal piston rings — 1/16-inch, 1/16-inch, 3/16-inch configuration
• Clevite high-performance "H" Series rod and main bearings (narrowed rod bearings included)

Key Specifications:

• Displacement: 383ci
• Stroke: 3.750 in.
• Bore: 4.030 in. (0.030 over)
• Connecting Rod Length: 6.000 in. (center-to-center)
• Rear Seal Type: 2-Piece
• Horsepower Capability: Up to 1,500 HP (with ARP 2000 cap screws)

Each Manley rotating assembly kit is precision internally balanced in-house at Manley's facility, saving time and ensuring accuracy before installation. Manley Performance has been engineering high-quality internal engine components since 1966, making this kit a proven choice for street/strip and performance builds.