ARP connecting rod bolts, BMW E9x M3 4.0L V8 (S65)

ARP high-strength connecting rod bolts, BMW M3 E90 / E92 / E93 4.0 V8 (S65B40)

ARP manufactures the industry’s most renowned ultra-strong fasteners, including cylinder head studs, flywheel bolts, crankshaft bolts, and connecting rod bolts. In tuned and high-revving engines, the loads placed on these bolts are extremely high – many bottom-end failures, gasket leaks, and fractures ultimately occur because an OEM bolt stretches or cannot withstand the stress applied to it.

BMW’s S65 V8 revs high even in stock form, and in performance use the connecting rod bolts are one of the most critical components. This ARP rod bolt kit is designed specifically for the requirements of the S65 engine, offering a significantly greater safety margin compared to factory bolts – especially in track use, high-rpm driving, and increased power levels.

Technical Specifications

• Fitment: BMW M3 E90 / E92 / E93, 4.0L V8 S65B40 (connecting rod big-end bolts)
• Size: 7/16″ bolt, 45 mm length
• Thread: M9 x 1.00
• Bolt head: 12-point
• Set: 16 pieces (complete set for V8 engine)
• Material: Custom Age 625+ – extremely durable alloy for high-revving engines

Bolts manufactured from Custom Age 625+ provide exceptional tensile strength and fatigue resistance, making them a typical choice for high-revving or high-output racing engines.

Read more about ARP technology and the factors that affect bolt failure:

Information about ARP materials and manufacturing on the official website

Always use ARP Ultra-Torque lube during installation and follow the manufacturer’s torque/stretch specifications to ensure correct bolt preload!