I finally had a chance to bore out one of my intake ports on the mill yesterday. One down, five to go. At least I know what I will be up to during my lunch breaks all this week.

As the pics show my bore angle calculations were dead on the mark. To properly mate up with the larger part of the port the hole is bored 3.2 degrees towards the combustion chamber.

The new port size is now 39.5 mm.

There is still a little blending to do but the end of my headwork is near.

As the marker shows the area near the injector port will be a little narrow so I will probably add some epoxy to that area for a little extra safetey margin.

The most hair raising part of this operation is that the reamed out intake port comes within 0.09" of the valve spring seat.

So far so good at least.