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USD 399.95
Part #: XD388

XDP HD High Boost Valve Spring Set XD388

Vehicle Fitment:
2003-2010 Ford 6.0L/6.4L Powerstroke | See full application list below
Part #: XD388
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The XDP HD 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”
Installed Pressure: 90lbs 
100Lbs @ .800”
252Lbs @ 1.250” 
Coil Bind: 1.14”
Shipping Restrictions Apply shipping restriction icon This product can not be shipped to these states/provinces: CA


  • MPN XD388
  • SKU XD388
  • ID 102969
  • Manufacturer Name XDP
  • Shipping Weight 4.00 lb.
  • Shipping Length 13 in.
  • Shipping Width 4 in.
  • Shipping Height 4 in.
  • Fuel Type Diesel
  • Warranty Info 1 Year / Unlimited Mileage
  • Prop 65 Prop 65 WarningWARNING: Cancer & Reproductive Harm -
  • Internal L0R3


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