(Click to zoom)
This exhaust valve is telling a story. The red arrows indicate some serious wear on the face (this area is supposed to be flat). The yellow area shows an edge of the valve that is entirely burned away. This valve is f$%&#@ - it's warped badly enough that it won't come out of the block. I'm not sure what has happened exactly, possibly the engine overheated or was run with the wrong oil (or no oil).
Anyway this explains the oil consumption, oil smell, and backfiring.
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