Heavy Duty High Boost Valve Spring Set 2003-2010 Ford 6.0L/6.4L Powerstroke XDP


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The XDP Heavy Duty High Boost Valve Spring Set XD388 is an essential upgrade to strengthen and gain control of the valvetrain on your 2003-2010 Ford 6.0L/6.4L Powerstroke. These valve springs deliver improved valve control over a factory valve spring with increased spring pressure to minimize valve float.

Each spring endures a stress relief process and is computer load mapped to provide a high-quality product with long-term durability. Tested within 1 lb of seat pressure, the XD388 comes as a complete set and includes XDP's 1-year unlimited mileage warranty. Valve springs only, this set re-uses your factory retainers and locks.

  • Set of 32 Springs
  • 100 Lb. Seat Pressure
  • Performance Valve Spring Kit
  • Essential For Elevated Boost Levels
  • 1-Year Unlimited Mileage Warranty


  • Installed Height: 1.830 inch
  • Installed Pressure: 90lbs
  • 100Lbs at .800 inch
  • 252Lbs at 1.250 inch
  • Coil Bind: 1.14 inch