XDP HD High Boost Valve Spring Set 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 2 year / unlimited mileage warranty. Valve springs only, this set re-uses your factory retainers and locks.
Features:
Set of 32 Springs100 Lb. Seat PressurePerformance Valve Spring KitEssential For Elevated Boost Levels 2 year / unlimited mileage warrantySpecifications:Installed Height: 1.830”Installed Pressure: 90lbs 100Lbs @ .800”252Lbs @ 1.250” Coil Bind: 1.14”WarrantyAll product warranties if any, implied have been done so at the discretion of the manufacturer. If you need warranty assistance on any product you've purchased, please contact the manufacturer directly.Products manufactured by XDP carry a 2-Year warranty against defects in materials and craftsmanship. The Warranty is Limited to two (2) years from the date of sale and limited solely to the parts contained within the product's kit. All products that are in question of Warranty must be returned shipping prepaid to XDP and must be accompanied by a dated proof of purchase receipt. Warranty is limited to the original purchaser.Under no circumstances shall the Xtreme Diesel Performance, LLC. be liable for any labor charged or travel time incurred in diagnosis for defects, removal, or reinstallation of this product, or any other contingent expenses.Vehicle Fitment YEAR MAKE MODEL FOR ENGINE SERIES 2004 Ford E-350 Super Duty 6.0 2005 Ford E-350 Super Duty 6.0 2006 Ford E-350 Super Duty 6.0 2007 Ford E-350 Super Duty 6.0 2008 Ford E-350 Super Duty 6.0 2009 Ford E-350 Super Duty 6.0 2010 Ford E-350 Super Duty 6.0 2004 Ford E-450 Super Duty 6.0 2005 Ford E-450 Super Duty 6.0 2006 Ford E-450 Super Duty 6.0 2007 Ford E-450 Super Duty 6.0 2008 Ford E-450 Super Duty 6.0 2009 Ford E-450 Super Duty 6.0 2010 Ford E-450 Super Duty 6.0 2003 Ford Excursion 6.0 2004 Ford Excursion 6.0 2005 Ford Excursion 6.0 2003 Ford F-250 Super Duty 6.0 2004 Ford F-250 Super Duty 6.0 2005 Ford F-250 Super Duty 6.0 2006 Ford F-250 Super Duty 6.0 2007 Ford F-250 Super Duty 6.0 2008 Ford F-250 Super Duty 6.4 2009 Ford F-250 Super Duty 6.4 2010 Ford F-250 Super Duty 6.4 2003 Ford F-350 Super Duty 6.0 2004 Ford F-350 Super Duty 6.0 2005 Ford F-350 Super Duty 6.0 2006 Ford F-350 Super Duty 6.0 2007 Ford F-350 Super Duty 6.0 2008 Ford F-350 Super Duty 6.4 2009 Ford F-350 Super Duty 6.4 2010 Ford F-350 Super Duty 6.4 2003 Ford F-450 Super Duty 6.0 2004 Ford F-450 Super Duty 6.0 2005 Ford F-450 Super Duty 6.0 2006 Ford F-450 Super Duty 6.0 2007 Ford F-450 Super Duty 6.0 2008 Ford F-450 Super Duty 6.4 2009 Ford F-450 Super Duty 6.4 2010 Ford F-450 Super Duty 6.4 2003 Ford F-550 Super Duty 6.0 2004 Ford F-550 Super Duty 6.0 2005 Ford F-550 Super Duty 6.0 2006 Ford F-550 Super Duty 6.0 2007 Ford F-550 Super Duty 6.0 2008 Ford F-550 Super Duty 6.4 2009 Ford F-550 Super Duty 6.4 2010 Ford F-550 Super Duty 6.4
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 2 year / unlimited mileage warranty. Valve springs only, this set re-uses your factory retainers and locks.
Features:
Set of 32 Springs100 Lb. Seat PressurePerformance Valve Spring KitEssential For Elevated Boost Levels 2 year / unlimited mileage warrantySpecifications:Installed Height: 1.830”Installed Pressure: 90lbs 100Lbs @ .800”252Lbs @ 1.250” Coil Bind: 1.14”WarrantyAll product warranties if any, implied have been done so at the discretion of the manufacturer. If you need warranty assistance on any product you've purchased, please contact the manufacturer directly.Products manufactured by XDP carry a 2-Year warranty against defects in materials and craftsmanship. The Warranty is Limited to two (2) years from the date of sale and limited solely to the parts contained within the product's kit. All products that are in question of Warranty must be returned shipping prepaid to XDP and must be accompanied by a dated proof of purchase receipt. Warranty is limited to the original purchaser.Under no circumstances shall the Xtreme Diesel Performance, LLC. be liable for any labor charged or travel time incurred in diagnosis for defects, removal, or reinstallation of this product, or any other contingent expenses.Vehicle Fitment YEAR MAKE MODEL FOR ENGINE SERIES 2004 Ford E-350 Super Duty 6.0 2005 Ford E-350 Super Duty 6.0 2006 Ford E-350 Super Duty 6.0 2007 Ford E-350 Super Duty 6.0 2008 Ford E-350 Super Duty 6.0 2009 Ford E-350 Super Duty 6.0 2010 Ford E-350 Super Duty 6.0 2004 Ford E-450 Super Duty 6.0 2005 Ford E-450 Super Duty 6.0 2006 Ford E-450 Super Duty 6.0 2007 Ford E-450 Super Duty 6.0 2008 Ford E-450 Super Duty 6.0 2009 Ford E-450 Super Duty 6.0 2010 Ford E-450 Super Duty 6.0 2003 Ford Excursion 6.0 2004 Ford Excursion 6.0 2005 Ford Excursion 6.0 2003 Ford F-250 Super Duty 6.0 2004 Ford F-250 Super Duty 6.0 2005 Ford F-250 Super Duty 6.0 2006 Ford F-250 Super Duty 6.0 2007 Ford F-250 Super Duty 6.0 2008 Ford F-250 Super Duty 6.4 2009 Ford F-250 Super Duty 6.4 2010 Ford F-250 Super Duty 6.4 2003 Ford F-350 Super Duty 6.0 2004 Ford F-350 Super Duty 6.0 2005 Ford F-350 Super Duty 6.0 2006 Ford F-350 Super Duty 6.0 2007 Ford F-350 Super Duty 6.0 2008 Ford F-350 Super Duty 6.4 2009 Ford F-350 Super Duty 6.4 2010 Ford F-350 Super Duty 6.4 2003 Ford F-450 Super Duty 6.0 2004 Ford F-450 Super Duty 6.0 2005 Ford F-450 Super Duty 6.0 2006 Ford F-450 Super Duty 6.0 2007 Ford F-450 Super Duty 6.0 2008 Ford F-450 Super Duty 6.4 2009 Ford F-450 Super Duty 6.4 2010 Ford F-450 Super Duty 6.4 2003 Ford F-550 Super Duty 6.0 2004 Ford F-550 Super Duty 6.0 2005 Ford F-550 Super Duty 6.0 2006 Ford F-550 Super Duty 6.0 2007 Ford F-550 Super Duty 6.0 2008 Ford F-550 Super Duty 6.4 2009 Ford F-550 Super Duty 6.4 2010 Ford F-550 Super Duty 6.4
HSP offers a limited lifetime warranty to the original purchaser on eligible HSP products. Underhood powder coating has separate two-year limited coverage. Non-HSP brands follow their own manufacturer warranties. Discontinued products and customer/installer damage are excluded. Claim authorization is required; customer pays inbound shipping for ordinary claims.
Return and warranty information is based on what HSP Diesel offers. Product-specific eligibility and the supplier’s published conditions apply; FullSpecDiesel does not add or extend coverage.
HSP Diesel warranty policyView complete warrantyProduct conditions
Return and warranty information is based on what HSP Diesel offers. Product-specific eligibility and the supplier’s published conditions apply; FullSpecDiesel does not add or extend coverage.
Professional installation is recommended.
- Return eligibility
- HSP states returns must be postmarked within 30 days of purchase, new and unused with original tags and packaging, with an approved RMA. A 15% restocking fee and customer-paid return shipping apply. Special orders, non-HSP dropship products, apparel, used items and custom colors are excluded. Based on what HSP Diesel offers.
- Return window
- Not stated for this product; see supplier terms
- Restocking fee
- See supplier terms; no product-specific fee stated
- Return shipping
- Based on the supplier’s return policy; see terms
- Made to order
- No
- Backorder status
- Not backordered
- Cancellation
- Subject to supplier terms; contact FullSpecDiesel before requesting cancellation
- Warranty provider
- HSP Diesel
- Warranty duration
- Product-specific duration not stated; see supplier terms
- Compatibility
- Listed for specific vehicle configurations
- Legal use
- Street legal
- Processing estimate
- 3–10 business days supplier processing
- Shipping
- Shipping calculated at checkout
- Signature
- No signature requirement
- Supplier
- HSP Diesel
Product compatibility is based on the vehicle and product information provided. Review your selected truck, product options, measurements, modifications, and installation requirements before ordering.