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Ok i am having the same problem with the lumina.....i have a 99.....yes the heads are aluminum.....it doenst take much to crack them......mine was a bad water pump and the thermosat went bad.....the engine kept getting hot.....now i have coolent spaying from the heads.......so when you change the blown head.....have someone check the thermosait and the water pump so it doesnt happen agian.......and good luck

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Q: 1994 Chevy lumina minivan 3.1L rear head gasket blown how hard is it to get at and are they aluminum?
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