Stock valve springs cannot handle higher rpm and boost, which leads to valve float and reversion. The XDP XD389 conical spring kit controls the valves from stock to race builds. It fits 1989-1998 Dodge with the 5.9L 12 valve Cummins.

Specs: 1.940 inch installed height, 172 lb installed pressure, 375 lb open at 1.275 inch, 1.225 inch coil bind. No core charge applies to this part.

Key Features & Benefits

• Rating: Safe to 5,000 rpm and built for elevated boost.
• Includes: Complete set of springs, locks and retainers.

Technical Specifications

• Manufacturer/Brand: XDP
• Part Number/SKU: XD389 (xdpXD389)
• Product Type: Performance Valve Springs & Retainer Kit
• Truck Compatibility: 1989-1998 Dodge with the 5.9L 12 valve Cummins
• Engine Platform: 5.9L 12V Cummins
• Core Requirement: No core required
• Warranty: XDP lists a 2 year / unlimited mileage warranty

Vehicle Fitment & Technical Installation Notes

Fits 1989-1998 Dodge with the 5.9L 12 valve Cummins.

Installation Tip: Confirm installed height on your head before install.