u/who-cares6891

Ok so I took it to a buddy who is an old school type mechanic (carb engines ). Just to double check if it was the head gaskets before I started tearing it apart. He solved the issue and it turned out to be the heater hose port in intake manifold was to big causing back flow or negative pressure whatever it’s called through heater core only and not rad. He showed me how it bubbled and only flowed through the heater hoses w rad cap off He crimped the heater hoses and it immediately quit bubbling and I could see it flowing through the rad instead. I bought caps for the heater hose ports till I can source a smaller outlet for the port. I drove it for 45 mins and it never got above 180. Highway and in town. He told me they used to weld a washer on top of the port to solve the issue. I may try tht. Anyways thanks for all your input and thank goodness it was a simple fix but I’ve never heard of an issue like this so I would’ve never found it.

Getting exhaust in coolant and overheating after camshaft swap. Whole cooling system is new I mean all. Air is out system also. Thermostat is opening. My ? Is could intake manifold gaskets be cause of this since i re used the old one or is it most likely head gasket. Keep in mind the engine ran perfect before the cam swap which is max lift if 550. Engine hasn’t run hot enough to blow head gaskets imo. Never got above 220-230. Red line is 260 on gauge. I put the chemical tester and it just blew the liquid out of it. Thanks for info.