hello to all ,I have a pair of d333 cats in a boat I bought recently ,my question that I need some help with is this . one of these engines hasn,t run in a long time so i have begun the tear down to rebuild,now the problem is Ihave heard through the grapevine that this engine has been rebuilt twice before because of coolant entering where it should not,so now as far as I know this can only be the head ie pre cup seals /warpage /cracked etc. now this problem most likely resulted in overheating,so does anyone know if the block itself can be damaged by this and render it useless or should I just get a new head and proceed as planned, money is a huge factor so I must choose wisely any and all help much appreciated ,p.s other engine runs perfectly thanks.