Performance Valve Springs and Retainer Kit Powerstroke 6.7 Model Year Information: 2004 Models:

Model Year Information: 2004 Models: If you have a 2004 model you must check your VIN code to determine your production date

Each kit comes ready to install with the brackets

**Polished covers can take a 1-2 week lead time**

boost throttle response

Avoid a costly failure down the road and convert your CP4 to a CP3 with our complete

Performance Valve Springs and Retainer Kit Powerstroke 6.7 Model Year Information: 2004 Models:The 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