SBM Rod Bolt Kit - Fits 318/340/360 (2)

The ARP Small Block Mopar Rod Bolt Kit (144-6021) is a high-performance connecting rod fastener set engineered for 318, 340, and 360 cubic-inch Mopar engines. This kit pairs premium 8740 chromoly bolts with black oxide finish, delivering the clamping force and fatigue resistance required for sustained high-RPM operation and boost applications. ARP rod bolts are purpose-built for engine builders and performance enthusiasts who demand reliability under extreme conditions.

The 8740 chromoly material provides superior strength-to-weight characteristics compared to OEM fasteners, extending the safe operating window before fatigue failure occurs. Black oxide coating protects against corrosion while maintaining precise bolt torque specifications and preload values. This two-piece kit covers one complete rod assembly, making it essential for full engine builds where stock fasteners cannot withstand increased boost, nitrous, or extended RPM limits. Proper installation requires ARP assembly fluid and accurate torque specifications to achieve the clamping force the design depends on.

Performance engine builders and Mopar enthusiasts upgrading 318/340/360 blocks for street or competition use choose ARP rod bolts as a foundational upgrade. Whether preparing an engine for sustained high-RPM operation, forced induction, or nitrous oxide systems, upgraded rod fasteners prevent catastrophic internal failure. This kit is a core component in any modern small-block Mopar build where reliability and repeatability matter. The ARP 144-6021 rod bolt kit for small block Mopar applications is sold as a pair and is compatible with 318, 340, and 360 cubic-inch displacement engines across all Mopar generations.