Upgrade the weak factory connecting rod bolts in your 3.9L Cummins 4BT by installing the ARP 247-6304 Rod Bolt Kit. This rod bolt kit is made from 8740 alloy chrome-moly Steel provides 200,000 PSI tensile strength to handle increased horsepower levels. These bolts have been proven to be near 5 times more reliable than the stock bolts in cycle testing.
- Made In The USA
- 200,000 PSI Tensile Strength
- 8740 Alloy Chrome-Moly Steel
- Substantially Stronger Than OEM