The port size in the valve was the same as the breech seal I decide to use.
The intake port may be drilled also but with the increased volume it should not
make much of a difference for the .22 guns. Larger caibers can benefit from a
larger intake especially if they are tube bulked.
Use a dremel to change the port angle. Then polished it up with a thin strip
of 600 grit sandpaper taped to a the back end of a small drill bit or similar
item, installed on the dremel. This is polished the area I just dremelled out.
Also polishe the other area marked on the diagram. If I had messed this one up,
bottom arrow, my valve would leak constantly. I could have left it alone without losing
much at all but the more polished everything is the smoother the flow. As you can see
this port is not perfect. The angled area could be brought all the way up to the top edge
of the port and polished better for optimum performance, but you get the idea.
