Heavy Duty High Boost Valve Spring Set 2003-2010 Ford 6.0L/6.4L Powerstroke XDP Fuel Delivery~Fuel Filters The smaller nozzle will help

The smaller nozzle will help with your towing ability and keeping your EGTs down while the 75% is better for top end power

**11-14 Trucks & 11-16 Cab N Chassis Trucks require a RetroFit Kit

Please check your vehicle to confirm

Studs are manufactured in an ISO/TS 16949 quality control facility

Heavy Duty High Boost Valve Spring Set 2003-2010 Ford 6.0L/6.4L Powerstroke XDP Fuel Delivery~Fuel Filters The smaller nozzle will helpThe 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