{"product_id":"valve-spring-and-retainer-kit-for-5-9l-cummins","title":"Valve Spring and Retainer Kit for 5.9L Cummins","description":"The XDP XD389 Performance Valve Spring \u0026amp; Retainer Kit is a critical upgrade for modified 1989-1998 Dodge 5.9L Cummins engines. Factory valve springs are often inadequate for the higher boost pressures found in performance builds, leading to valve float that severely compromises engine performance. This kit directly combats that issue, fortifying the valvetrain to handle increased boost levels and ensuring the engine operates correctly with other performance modifications.\n\nThis kit features an advanced conical spring design, which offers superior valve control compared to standard springs. This innovative shape also allows for a smaller and lighter spring retainer that is simultaneously stronger due to its reduced size. Unlike many other valve spring options, the XD389 is designed for broad applicability, fitting seamlessly into trucks ranging from stock configurations to heavily modified performance builds, making it a comprehensive, one-and-done solution for future power enhancements.\n\nEach spring within the XD389 kit undergoes rigorous quality control, including computer load mapping to ensure precise seat pressure matching within 1 lb, followed by a stress relief process. This meticulous attention to detail guarantees both quality and long-term reliability. The complete kit includes all necessary springs, locks, and retainers, and is backed by a 1-year manufacturer's unlimited mileage warranty. It is important to note that this product is not legal for sale or use in California.","brand":"XDP","offers":[{"title":"Default Title","offer_id":52664141381944,"sku":"XD389","price":399.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/687542452.png?v=1784333981","url":"https:\/\/store.motormia.co\/products\/valve-spring-and-retainer-kit-for-5-9l-cummins","provider":"MOTORMIA","version":"1.0","type":"link"}