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Hi changing to mechanical is a big job. I don't think that is your problem. Have you done work on the engines? IF you have changed the head and used a head that has been rebuilt not a new casting could be your trouble also if you do not let the engines cool down after running hard when you shut them they can over heat and not record it. I have worked on many-many Detroit's. But I need more history to help you. I know I can Help You