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may be less costly to put a pump inn the turbo coolant lines and not worry about thermosyphon. Use a snap disk heater switch? to shut off solenoid to pump's power feed after coolant reaches temp xyz. Much less costly to do that than to have a new exhaust manifold made. If your doing that...

how was the turbo cooler plumbed on the boats? what is a separate cooler from the engine orr? Knowing this could help your plumbing decisions. My guess is for the 350hp output one needs tremendous cooling...... which was likely much easier to do in a boat surrounded by water???