I hate those plastic valves as well, they´re such a stupid move by Wilesco...
Would have been way better, if they´d upped their pricetags a couple of bucks, and stayed with the well functioning valves they had already.
But otherwise a beautiful looking engine, that seems to move towards being a very smooth runner, just as soon as it has been properly run in.
Congratulations on getting one of these, and thanks for sharing!