Skip to content
Free Shipping Over $100
Free Shipping Over $100

XDP Heavy Duty High Boost Valve Spring Set XD388

by Xdp
Original price $399.95 - Original price $399.95
Original price
$399.95 - $399.95
Current price $399.95
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”
Installed Pressure: 90lbs 
100Lbs @ .800”
252Lbs @ 1.250” 
Coil Bind: 1.14”

Products manufactured by XDP carry a 1-Year warranty against defects in materials and craftsmanship. The Warranty is Limited to one (1) year from the date of sale and limited solely to the parts contained within the product's kit. Click Here for full warranty policy.