Theonly thngs that would cause this problem are the heads, the gaskets or the block. When you checked the block did you rotate the engine and check each cylinder? Did you yse a light . Cylinder walls can have a hair line crack and they are hard to see. If you replaced the heads, then that would lead to the head gasket. There is a certain way that these go on. Some gaskets say which is top, some don't. rule of thumb is that the written side is always up. Sorry to say no matter what the problem is, it has to be redone. Some thing you can try, this has only worked for me a couple of times. After some one did the job. Loosen all the head bolts, then retighten them in order exactly how the manual specifies. don't take it completely apart. do as little disassembly as possible. then try it again, see if the exhaust problem goes away. this is just a shot in the dark before you completely tear it apart.
Thank you! Unfortunately I did not rotate the pistons to look at the entire block. I just looked at what was showing. The cylinder head guy said these blocks cracking almost never happens. In hindsight I see how stupid it was not to check. The head gasket didn't say top , so I may have done it wrong, but I don't think so.. The only thing I'm sure is the intake manifold wasn't torqued well and the gasket may have gotten messed up because of problems I was having when installing it. Is there any way the air in the coolant could be forced in through the intake manifold gasket? The truck has tons of power but it is forcing massive amounts of air into the radiator. I also checked the air and it was positive for exhaust fumes.
No can't be the intake, it only sucks air
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