XDP HD High Boost Valve Spring Set XD388

The 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 for consistency, the XD388 comes as a complete set. Valve springs only, this set re-uses your factory retainers and locks.

Installed Height: 1.830”

Installed Pressure: 90lbs 

100Lbs @.800”

252Lbs @ 1.250” 

Coil Bind: 1.14”