ProMaxx CHR621N Replacement Cylinder Head

2007.5+ Dodge 6.7L Cummins (#3977225 - #3977221)
ProMaxx Performance
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The ProMaxx CHR621N Replacement Cylinder Head for your 2007.5+ Dodge 6.7L Cummins is designed as replacement cylinder heads with thicker castings in crack prone areas. Sold as a complete cylinder head with valves, valve seals, springs, retainers and locks, these new castings are sold without a core charge and come ready to install. 


  • New Casting 
  • Improved Casting In "Problem Areas" 
  • No Core Charge!
  • Fits Casting Numbers: #3977225 - #3977221
Application Note:These cylinder heads are casting specific, not model year specific. Please confirm the casting number on the head you currently have to confirm fitment. 

 Truck Freight Item: Allow 1-2 weeks for delivery. Truck freight charges apply. 

Shipping Note: This product ships truck freight. To avoid any issues, you must pre-select the shipping option of commercial, or residential, as well as the lift gate and non lift gate option. If you do not have a forklift, you will need a lift gate. 
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