ARP Fasteners Gen 3 B48 / B58 Main Bolt Kit

Built for strength and reliability, the ARP Main Bolt Kit is the ideal upgrade for MINI Gen 3 B48 engines, including Cooper S, JCW, and GP models. Manufactured from ARPs famous 2000 series steel, these high-performance main bolts offer superior clamping force and fatigue resistance compared to OEM fasteners.

The kit is supplied with sufficient bolts to secure the 6 cylinder B58 variant so if you have BMW M series car using the B58 or Toyota Supra with the same engie these are for you to. Get in touch about our Supertech components too, these can be supplied for the 6 cylinder B58 too. 

Perfect for high-boost, forged, or track builds, ARP bolts help maintain main bearing alignment and bottom-end integrity under extreme stress and RPM.

Key Features:

• Fits MINI Gen 3 B48 engines (Cooper S, JCW, GP)

• Made from heat-treated 2000 series steel

• Increased clamping force and durability

• Improves bottom-end strength and reliability

• Ideal for high-performance and boosted applications