Steam Engine 3

I drew a two-valve system that would use one push-rod and a linkage to make the two valves oscillate in opposite timing, but then I realised I could do that with a one-valve system. The heads are simpler and it's less complicated without the linkages. Also did a major re-design of the engine block.

( Major redesign of engine block, Valves, and more valves. )

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