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XD386 XDP Performance Valve Springs & Retainer Kit - GMC/Chevy 6.6L Duramax 2001-2016

SKU: XD386
Mftr. Part#: XD386
The XDP Performance Valve Spring & Retainer Kit features a conical design that offers improved valve control over a basic straight spring, it can be used it a wide range of applications making it the perfect option for your 2001-2016 GMC/Chevy 6.6L Duramax truck.

PRODUCT SPECS (click to expand)

Attribute nameAttribute value
Truck Type/ModelDuramax
Product TypeValve Springs
BrandXDP (Xtreme Diesel Performance)


The conical design of the XDP Performance Valve Spring & Retainer Kit offers improved valve control over a basic straight spring. The conical shape allows for a smaller and lighter weight spring retainer that is more robust due to the reduction in size. Unlike other aftermarket valve springs this valve spring kit can be used on a wide range of applications from stock to race-built engines making it the perfect "one and done" upgrade that lets you upgrade in the future to support more power. Each spring is subjected to a stress relief process and is computer load mapped to give a superior-quality product with long term resilience. Tested with 1 lb of seat pressure this valve spring & retainer set comes complete with locks, retainers, springs and is supported with 1 year of warranty.


  • Conical spring design
  • 125 lb Seat pressure
  • Essential for elevated boost levels
  • Complete set of springs, locks & retainers


  • Installed height: 1.610"
  • Installed pressure: 125 lbs
  • Open pressure: 210 lbs @1.275"
  • Coil bind 1.225"