tbh it doesnt sound like your pissed off with the wait but more so about the never ending rise on the final bill...which is fully understandable. As said before, the whole engine should have been stripped for a complete assessment then the job quoted as a whole...not done in dribs and drabs, its just very unprofessional. Most of the work I do is engine warranty rebuilds for a Vauxhall dealership..we cant keep going back and saying it needs this and that and possibly a set of these, we'd just get laughed at