the only way to tell if the head is cracked is to have a machine shop either pressure test or magnaflux the head.head has to be off for this.what are your symptoms?
might have been a good idea to state what car petrol/diesel as some cars like vw/audi suffer from oil cooler and the oil enters into the cooling system from there,spark plugs caked in carbon,car diagnostics checked for fault codes.?
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