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After the cylinder head or block have been skimmed.

For example. An engine has overheated and the cylinder head has been warped. The head is removed and milled so that the mating surface is flat again. The thickness of the oversized gasket will depend on the amount of material removed.

If a thicker gasket wasn't used, the compression ratio may be raised or the pistons may come into contact with the valves

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Q: When do you have to use a oversize headgasket?
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