Grumpy, have you ever flipped the breather valve over? I have put both of them back they way they came out.
I am well pleased with the condition of both bores, the amount of carbon cleaned away from the head and valves wasn't excessive on both.
[Linked Image]
[Linked Image]
Older engine.
[Linked Image]
Newer engine.

Next will be cleaning the heads up and lapping the valves.

Happy is he who penetrates the mystery of things.