nice clean seats
right, rebuilding the head... i have my own way which i was taught by a proper old school mechanic of rebuiling cylinder heads, and some stuff i do might seem unorthodox to some, but it's how i learnt.
first of all i soaked the valves in a petrol and diesel mix, to loosen the carbon. then each valve was placed with minimal grip into the chuck of a drill. using fine emery cloth - p280 - i spun the valve up and removed the carbon by holding the emery to it. and as you all can see the results are proper good
also using a drill shows you whether the stems are bent or not. if they're bent, the valve will try and throw itself out or vibrate when it's being spun at high RPM. mine spun nice and true with no vibrations
i replaced the the valve stem seals with a deep 10mm socket, small hammer and some grease. the grease just made sure the seal stayed in the socket as i located it onto the guide. they were put on gently but firmly, making sure each one made a nice metallic clank when hit showing the seal was all the way down
i lapped them in with a combination of hand and drill. the exhaust valves were badly pitted and required about 10 minutes each to lap in. using the drill here saved a lot of time. when doing this, i use a lot of oil along the stem - this prevents wear to the stem when the valve is being spun up by the drill. also it ensure that the valve will move freely once the engine starts. i know the car will blow some blue smoke because of this but it'll only be for a couple of seconds. once there were nice silver rings around the valve head, the job was done - and hopefully there will be compression!
putting the springs back was quite easy. some people i used to work with used to struggle with the collets. but it took me just over half hour to get all 16 valves securely in! not to boast or anything