Hello everyone im have a building of pressure into my cooling system on my hough h70 payloader, it has a Cummings c 160 engine in it. Oil looks clean and not mixing with coolant. I replaced the oil cooler and the seals on it thinking that was it but i fired it up after i had everything back together and it pressed the radiator up fairly quickly and started overcoming the radiator cap spring and coming out the over flow tube. Any input on what else could be causing this would be much appreciated. My next thought is the head gasket but i haven't had any luck finding one for this c 160 Cummings
Head gasket or cracked head