For the cylinder head itself, we turned to Drag Cartel for their Pro Series head. The Pro Series is basically all of the Supertech parts we just described, put in a K20A2 casting that has been modified by Drag Cartel. The intake valve seats are changed out for larger ones and the intake and exhaust ports are hogged out with a 5-axis CNC machine to Drag Cartels prescribed port shape. Then the head is flipped and the port bowls and entrances are CNC machined to improve flow. Finally, the combustion chamber is unshrouded around the valves and contoured to Drag Cartel’s specifications.
After the ports and combustion chambers have been machined, the valve seats are radius cut for the best flow and blended into the port and combustion chamber. Finally, the head is given a finely finished deck compatible with MLS gaskets. The head is assembled using the Supertech components and its ready to ship.
In the old days, getting a head done, ported and the machine work finished has always been the choke point in engine building. Usually, head guys are cranky or even crazy due to the many hours of tedious handwork that it used to take to produce a racing cylinder head. It would sometimes take months or even years to get your head done! Now companies like Drag Cartel have fully prepped heads built with the highest degree of precision sitting on the shelf just waiting for you to buy them!
The CNC intake ports of the Drag Cartel Pro Series head are awesome. With 5-axis CNC machines, every single head performs to its intended best due to there absolute repeatability. This was not possible with the hand ported heads of just a few years ago.
Drag Cartels CNC ported exhaust ports are awesome as well. We are so stoked that Drag Cartel has these assembled and ready to go without the drama and handholding often needed to get the cranky and crazy head guy just to finish your stuff!
A close look at the fine CNC cuts of the Drag Cartel ports.