Manley 29516RX Big Block Chevy 516ci Rotating Assembly Kit 4.000" Stroke 4.530" Bore

The Manley 29516RX is a high-performance rotating assembly kit engineered for Big Block Chevy (BBC) engines. Designed to displace approximately 516 cubic inches, this kit pairs a 4.000" stroke crankshaft with components sized for a 4.530" bore, delivering a substantial displacement increase for serious street and race builds. The "RX" designation indicates this assembly is supplied with upgraded "X" Series rod bearings featuring .001" extra oil clearance for high-performance and race applications.

Kit Highlights:

• Designed for Big Block Chevy (BBC) applications
• 4.000" stroke — compatible with standard deck blocks
• 4.530" bore sizing for approximately 516 cubic inch displacement
• Forged 4340 steel crankshaft — heat treated, stress relieved, shot peened, nitrided, and 100% magnafluxed
• Micro-polished, large-radius journals for reduced friction and wear
• Includes high-performance piston rings and Clevite® "H" Series rod and main bearings
• "RX" designation: upgraded X Series rod bearings with .001" extra clearance
• Horsepower capability up to 900 HP with ARP 8740 hardware; up to 1,500 HP with optional ARP 2000 cap screws
• Factory balanced to within +/- 1% of bobweight

Important Notes:

• Manley 4340 forged crankshafts are not intended for use with highly boosted roots-style cog belt superchargers
• Narrowed rod bearings required due to micro-polished large-radius journals
• Precision balancing (within 5 grams) available separately — order P/N 04000-1

Manley Performance has been a trusted name in high-performance engine internals since 1966, manufacturing components used in everything from street builds to professional race engines. The 29516RX rotating assembly delivers the displacement, strength, and reliability demanded by serious Big Block Chevy performance builds.