Connecting-rod bolts see extreme cyclic loads. Upgrading them is a smart move before raising power or rebuilding the bottom end.

The ARP 247-6304 rod bolt kit is for 3.9 Cummins 4BT. It replaces stretch-prone hardware with ARP fasteners built for high-load diesel use.

What you get

• ARP connecting-rod bolts as supplied in the kit
• ARP Ultra-Torque assembly lubricant (when included per ARP instructions)
• Fitment: 3.9 Cummins 4BT
• Follow ARP installation instructions for your exact kit

Specs

• ARP part number: 247-6304
• ARP torque/stretch note: stretch gauge, Stretch the bolts to . 0095 - . 0100
• ARP torque/stretch note: _ 95 ft-lbs using ARP Ultra-Torque Fastener

Ideal for rod rebuilds and higher-power diesel builds. Install with the ARP instruction sheet for 247-6304—use the supplied lubricant and torque or stretch procedure. Verify fitment for your exact engine and year before ordering.