If you click on the photo it will enlarge,you can then see the thread,
i have got a complete foxeye,bike and a complete 3he motor.
Yes i am going to port this head,but i am nowere near that stage yet.

Evilchicken0,will the 3he crank fit in the 4jh crankcases.

Apparently. It gives a longer stroke so the final engine will be a little slower revving