Heavy Duty High Boost Valve Spring Set 1998.5-2018 Dodge 5.9L/6.7L Cummins XDP Late Cummins 5.9 They feature a 7/16 diameter

They feature a 7/16 diameter and are built from only the highest quality seamless 4130/4135 chromoly tubing that is cold drawn over a mandrel to increase rigidity and reduce flex

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and many other items can put a burden on the factory equipped electrical and charging system

the integrated mounts points have been upgraded

Heavy Duty High Boost Valve Spring Set 1998.5-2018 Dodge 5.9L/6.7L Cummins XDP Late Cummins 5.9 They feature a 7/16 diameterControl the valvetrain in your modified 1998. 5 2018 Dodge 5. 9L Cummins with the XDP Heavy Duty High Boost Valve Spring Set XD390. The XD390 Valve Spring Kit is designed to help eliminate valve float due to elevated cylinder pressures and higher boost levels. Common upgrades like aftermarket tuning and fueling and turbo upgrades can cause valve float that results in severe engine damage. Intake valves can also be blown open from added boost levels