Manley 290130HX SBC 383ci Rotating Assembly 3.750" Stroke / 4.030" Bore -4cc Flat Piston with HX Main Bearings

The Manley 290130HX is a complete Small Block Chevy 383ci rotating assembly built around a 3.750" stroke and 4.030" bore with a -4cc flat-top piston configuration. This kit is specified with the optional HX Series main bearings, which provide .001" of extra clearance — ideal for high-performance and forced-induction builds requiring tighter oil control tuning.

Key Features:

• 4340 Forged Steel Crankshaft — Non-twist, lightweight design; heat treated, stress relieved, shot peened, nitrided, and 100% magnafluxed
• 4340 Forged Steel H-Beam Connecting Rods — 6.000" center-to-center length with 7/16" ARP rod bolts; rated to 750 HP (ARP 8740) or up to 1,500 HP with optional ARP 2000 cap screws
• 2618 Forged Aluminum Platinum Series Pistons — 4.030" bore / 1.125" compression height / -4cc flat-top design with premium chromoly wrist pins
• Total Seal Piston Rings — Classic Race conventional-style ring set with plasma moly ductile iron top rings, reverse-twist cast iron taper face second rings, and three-piece oil rings
• Clevite HX Series Main Bearings — .001" extra clearance over standard for precision oiling control
• Clevite H Series Rod Bearings — Narrowed design to match micro-polished large-radius crankshaft journals
• Piston Ring Oversize: +0.030"
• Note: Assembly is unbalanced — external balancing required

This rotating assembly is designed as a complete bottom-end foundation for a high-performance 383 stroker build. The combination of fully forged internals, ARP fasteners, and precision Clevite bearings makes the 290130HX suitable for street/strip, road race, and drag race applications targeting serious horsepower goals.