All done and running nice and quietly, well as quiet as these get. Just got to take it for a gentle run, then re check head bolt torque and tappets, top up water if needed and it's back to normal. Unlike the garage which despite the clean and put tools back as they're used intention is now covered in tools rags and old gaskets/seals. And I need to clean up the puddle of oil in the corner caused by not noticing I'd knocked the air filter over.