Manley 29632X BBC 632ci Rotating Assembly 4.750" Stroke 4.600" Bore +43cc Dome X-Series Bearings

The Manley 29632X is a complete Big Block Chevy (BBC) 632 cubic inch rotating assembly engineered for high-displacement, high-horsepower engine builds. Featuring a 4.750-inch stroke paired with a 4.600-inch bore and +43cc dome pistons, this kit is purpose-built for tall deck block applications and arrives factory balanced to within +/- 1% of bobweight. The "X" suffix designates the inclusion of Manley's optional X-Series rod bearings with .001" extra clearance, providing additional tolerance for demanding builds.

Key Features:

• 4340 forged steel crankshaft — lightweight design, heat treated, stress relieved, shot peened, nitrided, and 100% magnafluxed for maximum durability
• 4340 forged steel H-Beam connecting rods — 6.700" length with 7/16" ARP 8740 cap screws standard; ARP 2000 cap screws available for upgraded horsepower ratings
• 2618 forged aluminum Platinum Series pistons — +43cc dome configuration with premium chrome moly wrist pins
• X-Series rod bearings — Clevite® "H" Series narrowed rod bearings with .001" extra clearance for enhanced oil film protection
• Clevite® "P" Series main bearings — high-performance main bearing set included
• High-performance piston rings — Total Seal ring set included
• Center counterweights — included for improved balance at high RPM
• 2-piece rear main seal design
• Tall deck block fitment — designed specifically for 4.500"–4.750" stroke tall deck applications
• Factory balanced to within +/- 1% of bobweight

Specifications:

• Engine Family: Big Block Chevrolet (BBC)
• Displacement: 632 cubic inches (10.3L)
• Stroke: 4.750"
• Bore: 4.600"
• Piston Dome Volume: +43cc
• Rod Length: 6.700"
• Rear Main Seal: 2-piece
• Horsepower Rating: 900 HP (ARP 8740) / 1,500 HP (optional ARP 2000 cap screws)

The Manley 29632X rotating assembly delivers a complete, matched foundation for serious BBC stroker engine builds, combining premium forged components with precision-matched tolerances straight out of the box.