Buick Main Bolt Kit - Fits 455

The Buick Main Bolt Kit - Fits 455 is a critical engine assembly component designed for builders and enthusiasts working with the legendary 455 big-block platform. This ARP fastener kit upgrades factory main cap bolts to premium specifications, ensuring reliable clamping force and block integrity under high horsepower and high-RPM conditions. Whether you're building a stock restoration, a street performance engine, or preparing for competition, proper main bolt torque and material quality directly impact engine longevity and reliability.

ARP main bolts are engineered from premium alloy steel and shot-peened for fatigue resistance, offering superior tensile strength compared to OEM fasteners. The kit includes all hardware needed for complete main cap installation, with each bolt precisely manufactured to ensure consistent clamping load across the block. Proper main bolt torque sequence and specifications prevent block flex, reduce main bearing wear, and stabilize crankshaft alignment—critical factors when increasing boost, compression, or RPM limits on any 455 variant.

Mechanics and engine builders working on Buick 455 engines—whether in muscle cars, trucks, or performance builds—rely on this kit during full rebuilds, overbore work, or when upgrading internal components. Installation requires proper torque wrench technique and ARP's recommended torque sequence to achieve even clamping and prevent block warpage. This bolt kit is essential for any serious 455 build targeting reliability above stock power levels, making it a non-negotiable component for restorations and performance engines alike.