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D&J PRECISION MACHINE 6.7L Stage 4 24v Cummins Performance Head
Our Stage 4 Cummins Performance Head is designed for the extreme high performance. Includes everything in our Stage 3 Head, with a D&J Stage 4 Billet Runner style intake manifold. This head can only be used with 6.7l (4.212 inch) bore or larger.
Our Stage 4 Cummins Performance Head comes standard with oversize super alloy intake and exhaust valves, thread in soft plugs in the head, titanium valve spring retainers, and heavy duty extra large intake seats. This head can only be used with 6.7l (4.212 inch) bore or larger.
We have seen the stock intake seats fall out of the 1000 plus hp trucks. Our heavy duty extra large intake seats fix this problem. Also, we have seen the soft plugs under the valve cover come out filling the crankcase with coolant. We correct this issue with thread in soft plug.
Our Stage 4 billet intake runner the best Cummins performance head intake on the market. With reusable o-ring seals on the runner flanges, this intake is designed to keep give equal flow to all the cylinder in the head. With this intake we have EGTs across the cylinders between 70-125* of each other.
Our Stage 4 Cummins Performance Head gets the intake flow up to 320 CFM (stock is 165)
- You’re given the option to use your own head or one of our head cores
- Head is disassembled and all the soft plugs are removed
- Cleaned and blasted
- Crack check performed (If it checks out okay we proceed with this head)
- All-new bronze guides and heavy duty extra large seats on the exhaust side installed
- Heavy duty extra large intake seats
- 5 axis CNC port job performed
- Billet replacement style intake
- 1.500in Super alloy intake valves
- 1.450in Super alloy exhaust valves
- Thread in soft plugs under the valve cover
- High performance CNC valve job performed
- Head cleaned
- Assembled with all new valve seals and thread in soft plugs
- 115# springs
- Titanium retainers
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
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