i have this problem that it just happen >>>i have a clicking noise on head an it sound by the chain inside an as i go faster i hear it an my upper radiator hose sometimes it stars building air presur inside an as i open radiator cap it relase presure an hose is back to normal >>now i change oil syntetic mobile 1 an i still hear noise i was thinking it wasnt getting lubricated on vulve but i dont know if is head thats bad i can still drive but i dont want to its a 89 conquest ,,thanks for help an infohttp://www.starquestclub.com/forum/public/style_emoticons/default/blush.gif