XDP | SKU: XD390

XDP HD High Boost Valve Spring Set XD390

Name: XDP HD High Boost Valve Spring Set XD390
Brand: XDP
SKU: XD390
Price: 399.95 USD
Availability: InStock

$ 399⁹⁵

Can I pick up my order or have it installed at your shop?

Absolutely. We offer local pickup on most products and full professional installation at our shop in Washington, MO. Whether you just want to grab your parts or have our techs handle the install, we’ve got you covered. Give us a quick call at 636-429-7020 or message us to schedule a visit — we’ll make sure the parts are ready when you arrive.

How do I know if this part fits my vehicle?

Unsure if it’ll fit? No problem — that’s what we’re here for. Send us your vehicle’s year, make, and model, and we’ll verify fitment before you order. We can also point you toward compatible upgrades or supporting parts if needed.

What if I need to return a product or it’s defective?

Most unused items can be returned within 30 days in their original packaging. Some products are covered by a manufacturer’s warranty as well. If something arrives damaged or doesn’t meet your expectations, just let us know — we’ll help you get it replaced, refunded, or repaired. (Tracking updates are also emailed automatically once your order ships.)

What's the lead time on custom or fabricated parts?

Many of our parts are built to order — especially fabricated or performance components. These can take additional time to produce before shipping. Lead times vary by manufacturer and demand, but we’ll always keep you updated along the way. If you’re working on a tight schedule, reach out before ordering at 636-429-7020 and we’ll confirm current availability or estimated ship dates.

Description

Control the valvetrain in your modified 1998.5–2022 Dodge 5.9L Cummins with the XDP HD High Boost Valve Spring Set XD390. This kit is specifically engineered to eliminate valve float caused by increased cylinder pressures and higher boost levels.

Upgrades such as tuning, fueling modifications, and larger or compound turbochargers can push the factory springs past their limits. When valve float occurs, it can lead to serious engine damage. Added boost and exhaust drive pressure can also force intake valves open, creating reversion—a condition where exhaust gases enter the cylinder during the intake stroke—reducing efficiency and power potential.

The XD390 Valve Spring Set is the perfect solution for enthusiasts running aftermarket camshafts, upgraded turbos, or extensive fueling upgrades. Designed for a straightforward installation, these springs work with your factory retainers and locks.

With a reduced outside diameter, they also fit all 1998.5–2002 cylinder heads, regardless of casting differences, ensuring consistent and reliable performance.