Dennis, the valve guides are in. They do not project into the port.
Ed was packing to return from the Alvord when I was ready to leave. Going to see him run would not happen. I had Monday set aside as a vacation day from work. The bike was packed, so I tied on the cooler, crab boiling pot, and crab trap, and left town. Where I went was Fort Stevens and it is the farthest north part of Oregon. An area I had not crabbed and I had I to learn about new methods and crabbing spots. It worked out well. Caught two big juicy Dungeness crabs on Sunday and another one on Monday. The sun was out most of the time, the lunar eclipse was visible, and it did not rain. It does not get better than this.
The casting is cut apart and the areas are measured. All areas are for one port in square inches.
1.7 upstream end intake manifold,
1.7 at 0.7 inches toward intake valve in intake manifold,
1.9 at 1.4 inches toward intake valve in intake manifold,
2.4 at 2.2 inches toward intake valve at downstream end intake manifold and upstream edge cylinder head,
2.2 at 3.3 inches toward intake valve just upstream from bifurcation in cylinder head,
1.9 at 4.3 inches toward intake valve just upstream from guide recess in cylinder head,
1.7 at 5.0 inches toward intake valve just downstream from guide recess with valve stem cross-sectional area removed,
2.3 at 5.8 inches toward intake valve at face of closed intake valve with valve stem cross-sectional area removed (at leech mouth)
Cross-sectional area of steel valve seat rings with cross-sectional area of valves removed = 2.4
Valve stem thickness intake and exhaust = 0.19 inches