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What a ****-end I am. After months of carefully labelling everything and making sure nothing was in the wrong place, at the very end I somehow went and swapped the pair of RH cams round, with inlet on the bottom and exhaust on the top! No wonder it got stuck. I just hope I've not wrecked the valves. Hard to say with a compression tester as the engine's stone cold with very little oil in it. It seems fairly even at a very low level across the cylinders.