i have a set of PI heads with cams (already assembled) came off a 2000 GT. on the underside of the heads (intake/exhaust valves) are they ALL suppose to be closed???? or can some be open? For example....if they are used and they came off a 00GT and some of the pistons were down the valves should be open right? so i hope there is not a problem with mine. They look brandnew...i checked the valves and there are NO cracks in them....but a cuople of them are out....is that okay?