Cylinder Head

These are a couple of typical images of the exhaust ports on the cylinder head. This is a type B head so it has 1.65"(1-5/8") which are the same as almost all XK's. So this is the same as in the desireable C type head. This head is not known for its power but rather for torque and fuel economy. The intake ports are offset from the combustion chambers which causes a swirl to the fuel/air mixture. They are also relatively small so the mixture velocity is relatively high and that helps torque. So I want to breathe on these a bit with the idea that torque is most important, horsepower is ok, mileage be damned. So what I will be doing is cleaning up the ports and taking out the casting obstructions and enlarging slightly.