XDP HD High Boost Valve Spring Set XD390

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.

Features:

• Performance Valve Spring Kit
• Essential For Elevated Boost Levels (50 and up lbs)

Specifications:

• Installed Height: 1.340 inch
• Installed Pressure: 108lbs
• 192lbs at .920 inch
• Coil Bind: .800 inch