Manley 39615RHX BBC 615ci Rotating Assembly Kit 4.625" Stroke 4.600" Bore +43cc Dome

The Manley 39615RHX is a complete Big Block Chevy (BBC) rotating assembly kit engineered to build a massive 615 cubic inch stroker engine. Featuring a 4.625" stroke crankshaft paired with a 4.600" bore and +43cc dome pistons, this kit delivers the displacement and compression needed for serious high-performance and racing applications. The "RHX" designation indicates this assembly includes upgraded "H" Series main bearings with .001" extra clearance for enhanced oiling in high-horsepower builds.

Kit Highlights:

• Application: Big Block Chevrolet (BBC) — tall deck block required for 4.500"+ stroke
• Displacement: 615 cubic inches
• Crankshaft stroke: 4.625" — Manley 4340 forged steel
• Bore size: 4.600"
• Piston dome: +43cc — forged high-performance pistons
• Includes high-performance piston rings
• Includes Clevite® "H" Series rod bearings (narrowed) and "HX" Series main bearings with .001" extra clearance
• Crankshaft is heat treated, stress relieved, shot peened, nitrided, and 100% magnafluxed
• Micro-polished large-radius journals for superior bearing life
• Factory balanced to within +/- 1% of bobweight

Performance Notes:

• Horsepower range: up to 900 HP with ARP 8740 cap screws; up to 1,500 HP with optional ARP 2000 cap screws
• Tall deck block required for 4.625" stroke applications
• Not intended for use with highly boosted roots-style cog belt superchargers

Manley Performance has been a leader in high-performance engine components since 1966, and their BBC rotating assemblies are trusted by professional engine builders and racers alike. The 39615RHX provides a solid foundation for a purpose-built BBC stroker capable of exceptional power output on the strip or the dyno.