Performance Valve Springs and Retainer Kit


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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 is computer load mapped, to ensure quality and long-term reliability.

Each spring is matched within 1 lb of seat pressure to ensure consistency. Sold as a complete set with valve springs, retainers, and locks. Each kit is backed by XDP's 1-year unlimited mileage warranty.

  • 125 Lb. Seat Pressure
  • Conical Spring Design
  • Performance Valve Spring Kit
  • Essential For Elevated Boost Levels
  • Complete Set (Springs, Locks and Retainers)


  • Installed Height: 1.610 inch
  • Installed Pressure: 125lbs
  • 210lbs at 1.110 inch
  • Coil Bind: 1.050 inch