Has anyone out there ever changed the valve stem seals without removing the head? I am currently away from my shop and am hoping that it is possible to dissasemble the valves without removing the head or camshafts for that matter. Is it possible to compress the valves and get everything out without a complete removal? I know there are tools that will compress the valve and hold the stem, but i dont know if it is possible on our DOHC head. Any help is greatly appreciated!