Right, the valves are out and everything cleaned. It's looking like it's going to be an expensive trip to a reconditioning workshop for my head :(

The exhaust valves are very badly recessed and a couple of the valve stems are very sloppy in their guides. The exhausts are far worse than the inlets which surprisingly seem to have very little wear. Again it's cylinder 1 and cylinder 4 that are the worst as expected, the exhaust valve seats are heavily pitted and have deep steps before even attempting any grinding. It would be daft to grind the valves in and put the engine back together in that state as the manual specifically says that it needs inserts and new seats cutting.

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