VEVOR Cylinder Head Assembly, 6.7L Replacement for 2007-2018 Dodge Cummins 6.7L, Compatible with Dodge Ram 2500 3500 4500 Models, Complete Engine Cylinder Head Assembly Replaces 3977221, Cast Iron Solve Compatibility Issues Ready to Install Long Service Life Reliable Quality Efficient Problem Solver Installation Tips Injector Installation Hole Specification: M22 x 1.5,Part Number: 3977221,Injector Type: Straight Hole,Fuel: Diesel,Item Model Number: 129061101,Product Weight: 164.5 lbs/74.6 kg,Installation Location on Vehicle: Front,Intake Valve Diameter: 1.3 in/33 mm,Product Dimensions: 31.1 x 13.8 x 4.9 in/790 x 350 x 125 mm,Main Material: Cast Iron,Exhaust Valve Diameter: 1.3 in/33 mm