Product Description

ARP 247-6304 ROD BOLT KIT FOR 3.9L CUMMINS 4BT ENGINE

Upgrade the bottom end of your 3.9L Cummins 4BT with the ARP 247-6304 Pro Series rod bolt kit. Built from premium ARP2000/8740 alloy with exceptional tensile strength, these Wave-Loc™ bolts deliver stable clamping force that resists stretch and cap walk under heavy load—perfect for stock refreshes and high-boost builds alike. For best results, install with ARP ULTRA-TORQUE LUBRICANT (100-9909) and pair with complementary ARP hardware like ARP 247-4207 HEAD STUDS (4BT), ARP 247-6303 ROD BOLTS (5.9L/6.7L), and ARP 147-2502 BALANCER BOLT KIT. Shop the full brand lineup here: ARP @ CPP DIESEL.

ARP 247-6304, ARP rod bolts 4BT, Cummins 3.9L rod bolts, ARP Wave-Loc, ARP2000, 8740, diesel performance fasteners, 4BT connecting rod bolts, Pro Series rod bolts

FAQ

WHAT ENGINES DOES ARP 247-6304 FIT?
Designed for the Cummins 3.9L 4BT (4-cylinder) diesel. See fitment below.

WHAT TORQUE/LUBE SHOULD I USE?
Always follow the included ARP instructions and use ARP Ultra-Torque lubricant for accurate preload.

ARE THESE A DIRECT REPLACEMENT?
Yes—direct replacement for factory connecting rod bolts on 3.9L 4BT rods; verify rod condition and sizing during assembly.

WHAT OTHER HARDWARE SHOULD I CONSIDER?
Match with ARP 247-4207 head studs, ARP 147-2502 balancer bolt, and ARP Ultra-Torque to complete the fastener package.

Fitment

• Cummins 3.9L 4BT / 4BTA, 4-cylinder diesel (approx. 1984–2001 production)
• Application: Connecting rod bolts (cap screw, no washer)

Cross-Reference (ARP on CPP Diesel)

• ARP 247-4207 Head Stud Kit – 3.9L 4BT
• ARP 247-6303 Rod Bolt Kit – 5.9L/6.7L Cummins
• ARP 147-2502 Harmonic Balancer Bolt Kit – 5.9L Cummins
• ARP 100-9911 Ultra-Torque 20 oz
• Shop All ARP at CPP Diesel

Specifications for ARP 247-6304

Notes

• Always follow the ARP instruction sheet for this kit and use ARP Ultra-Torque during installation.
• Professional machine shop verification of rod big-end size and bolt stretch is recommended.