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I worked for GM/Cadillac 1993 to 1996 as a heavy line wrench, head gasket failures were a common place thing on our 4.5L's. In the case of the 4.5L they used a iron block and an aluminum head. Any overheat condition would result in a head gasket failure, and this holds true to many GM engines. As stated above the coolant mixed in the oil ate the bearings.
the cost of replacing the bearings, gaskets, head gaskets, having the cooling system flushed and cleaned correctly outweighed the cost of a crate 4.5. The solution we offered customers was a halfway point, the customer bought the crate motor for something like 2K at the time, and GM would cover the labor. I probably pulled four a week at the high point. Then the 4.9L and Northstar came out and the problem went away, not that others were not introduced....
Maybe you can get GM to cover some of the cost...
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2021 Model Y
2005 Cayenne Turbo
2012 Panamera 4S
1980 911 SC
1999 996 Cab
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