Also, I have seen on the 104 engine where the heat exchanger will allow weird things to happen when it pinholes.
I have had techs replace a headgasket and nothing was fixed!! Be sure this is properly diagnosed.
I have not replaced headgaskets on 104's for compresson leaks, only leaking oil.
When over-heated, any engine will blow the headgasket.
1991 GMC Syclone
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