Well after 2 weeks waiting on parts, the valve job on my 90' 740 is almost complete........... seems it was a freak occurence.... a chunk just sheared of of the top of one of the valves. As it was already torn apart I am having the timing belts replaced and due to the cheap plastic housing on the radiator becoming worn out and coming off with the hose a new radiator.......... anyone ever had any experiences with any of this?