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

the common rail diesel injection experts

0L Ford diesels

Supports Up To 750HP

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