XDP HEAVY DUTY HIGH BOOST VALVE SPRING SET FOR 1998.5-2022 DODGE RAM 5.9L/6.7L CUMMINS 1999-2003-7-3l-powerstroke the 683LS comes standard with

the 683LS comes standard with billet dampened lockup mechanism

which is why it comes in a clear bottle

80 (Low) / 8

and providing a 30% increase in power

XDP HEAVY DUTY HIGH BOOST VALVE SPRING SET FOR 1998.5-2022 DODGE RAM 5.9L/6.7L CUMMINS 1999-2003-7-3l-powerstroke the 683LS comes standard withControl the valvetrain in your modified 1998. 5 2022 Dodge 5. 9L 6. 7L 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