Mopar V8 Main Bolt Kit - 273-440 Wedge 2-Bolts

The Mopar V8 Main Bolt Kit - 273-440 Wedge 2-Bolts from ARP is an essential upgrade for serious Mopar builders and restoration shops working with classic Chrysler wedge-head engines. Whether you're rebuilding a 273, 318, 340, or 440 cubic-inch engine, these fasteners are engineered to replace the factory two-bolt main cap design with premium strength materials. This kit addresses the critical need for reliable clamping force in the engine's main bearing caps, where factory bolts can stretch and loosen under high RPM loads.

ARP bolts are manufactured from proprietary high-strength alloy steel and feature precise tolerances that ensure repeatable clamping loads when torqued to specification. The 2-bolt configuration fits the original casting design of wedge-head main caps, maintaining compatibility with your existing block and heads without requiring machine work. These fasteners are shot-peened and stress-relieved to eliminate fatigue failure points, and their superior tensile strength prevents the bolt stretch that allows crankshaft movement—a primary cause of bearing wear and upper-end noise in high-performance and street engines alike.

Technicians and engine builders rely on this kit during complete rebuilds, performance upgrades, or when upgrading older cores to modern reliability standards. The Mopar V8 Main Bolt Kit - 273-440 Wedge 2-Bolts is ideal for hot rod applications, street engines, and restoration projects where original fasteners may have lost preload or show signs of stretching. Installation requires only basic machine shop tools and knowledge of proper torque sequencing; ARP provides detailed instructions to ensure correct application and maximum longevity of your rebuild.