Performance Valve Springs and Retainer Kit Cummins 6.7 These are all bench tested

These are all bench tested on our Hartridge HA-230 flow bench once completed to ensure all flow rates and functionality

Supports Up To 750HP

the common rail diesel injection experts

This can be hard on a turbo and motor and is not recommended

resulting in a more even clamping force which allows you to obtain a more accurate torque reading

Performance Valve Springs and Retainer Kit Cummins 6.7 These are all bench testedThe XDP Performance Valve Springs and Retainer Kit XD386 are a perfect upgrade for your modified 2001 2016 GM 6. 6L Duramax. Camshaft upgrades and other modifications that increase boost require more valve control. The XDP Performance Valve Spring feature a conical design for better valve control than a standard straight spring. The conical design also allows for smaller and lighter spring retainers. Each spring undergoes a stress relief process and