[87dmaxlb7]

well I bought a 2004 lb7 that was wrecked to use drivetrain in a project im building I got the motor fired up, today I replaced the obvious bad parts prior to doing so the oil cooler was cracked and it had water in the oil. now that it runs no more oil/water mixing and sounds healthy. but there are air bubbles in the overflow and the radiator hose is hard so looks like bad head gaskets, but I want to be sure the air coming threw the overflow sounds like the horn is honking I thought at first the panic button was on but its just a motor! any body heard this?