On the head will be lifters and camshaft the cam shells in head.. have you drained oil out engine so check for metal parts in oil ? the cvh engine is a good engine to learn on i rebuilt one when i was 15 year old as part of my corse at school lol.. i always remember the guys face it was a mk4 estate escort i think the idea was to remove it and refit it but i pulled it out and pulled it to bits had it all in tubs marked whats what lol.. but i got that back together and running in a few lessons