i bought a turbo engine and was going to just put it straight in my car. but noticed the headgasket has gone,so i removed the head to see if ther was further damage.no signs but the under face ov the head is dirty and the valves am coverd in crap.so i striped the head down.i picked the worst valve out of them all and it has cleaned up,is it ok 2 do this or shall i just get new valves?