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If the motor was NOT started, if the head bolts WERE NOT torqued, then you would just need to make sure the head gasket was not pressed and put the head on correctly (head gaskets are cheap replace it if there is even a question).

If the head bolts were torqued (tightened at all) you must replace the head gasket.

If the motor was started then it depends on how hot it got. Water passages normally do not line up so the engine overheats very quickly because there is no coolant flow, oil flow is also interrupted in most cases; this leads to a myriad of problems including cracked heads, scorched bearings, etc. In this situation it is best to remove both heads, check the block deck to ensure it is not warped, and have the heads tested (re-tested) to ensure they are not warped or cracked.

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Q: What happens when you put a cylinder head on backwards?
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