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Depends on the car. Headgaskets on our 2004 Land Rover are considered a maintenance item about every 80K miles. Ours lasted about 100K miles. Usually its best to replace both sides rather than just one since the engine tear down cost is high. Its also not a bad idea to get the heads checked for worp, and finally you may want to get the valve guides replaced.
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2020 ZL1 1LE [Moroso SC Expansion Tank, otherwise stock]
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