[fastinjun]

This is my uncles car and Im doing this for him. Its a 2003 Venture that he has had since new. It overheated but there is no water in the oil and there is water in the radiator so Im thinking that the thermostat froze not allowing water to circulate. It runs rough, makes a bit of noise from the top end. Im guessing it bent a valve or ? My question is should I go ahead and take the heads off or just find a good used engine? Im just wondering if the sleeves have been scored due to over heating, if thats the case obviously finding a motor would be the better option but Im not too familiar with these motors so what options would any of you "pros' suggest??? I have located a 3.4 out of a 2003 impala, mileage unknown so I could be getting a bad motor again.
Thanks in advance.