Whip the head off and have a look for damage to the head, best to skim it and change the valve stem seals while your there. Doubt that by the time you get the head off that you will see any coolant on the top of the pistons, if there is just clean it off. Check the cylinder walls for damage and make sure all the pistons rise to the same height. (seen some engines bend a con rod when they hydraulic
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Goes without saying, change oil, filter, timing belt and tensioner, etc.
Steve.
