XCFM LS3 Cylinder Head CNC Package

These LS3 (821) Cylinder Heads have undergone a thorough process to ensure optimal performance. They have been taken apart, cleaned using an Aqueous parts washer, and given a CNC porting treatment. The head surface has been decked, and a competition valve job has been completed. The bowls have been meticulously hand blended, and the head surface has been deburred. Additionally, these heads have been assembled with BTR .660 springs and titanium retainers for maximum durability. We offer an Exchange Program for your convenience and minimum downtime. We will ship this set out to you for install and upon receiving your 821/823 heads in proper working condition, we will refund you $1200.