Got quite a few cpjo2 lifts running and they are water pump eaters. Radiators seem to bust at seams.Correct me if I am wrong but the platinum uses the same set up as the new cats.I have sevral of these running also,But no head gasket problems.Might want to take a cold lift and let it run till theromostat opens then rev engine to see if coolant if flowing.Im going to assume you have had a least 1 radiator flow checked.