The 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 ‘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