[Talonmotorsport]

Take the head off and give it a quick clean, turn it upside down so it's head gasket side up and pour a little petrol in the combustion camber. If the valves or seats are worn the petrol will seep through to the inlet/out ports. If there is only minor pitting just use course then fine grinding paste and a valve stick. If you've taken the head off then I personally would replace the tappets and valve seals while I'm at it.