Are we to take it that the engine was not overheating before the overhaul,what did you do, did you change the pistons and liners,if you changed the liners did you check the liner protrusion,if any one of the liners is low hot compression gases can leak into the coolant and cause overheating,the protrusion is crucial,but no point in me going on with it if the protrusion was checked and up to spec,warm the engine up,protect your hand and remove the rad filler cap,fill the coolant up to near the top,start the engine and set the speed quarter throttle,watch the coolant,you are looking for air bubbles coming to the surface,if you see bubbles it's bad news,there is compression getting into the cooling system and you say the head has been checked,the combustion chambers are not pitted and are tight with good gaskets the liners are suspect.
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