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Closed Cooling LS3?

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If the LS3 has a closed cooling system, can it be started out of the water, or is there still a raw water impeller for the heat exchanger that will be damaged?


also, as far as winterizing, obviously you don’t have to worry about the engine, but surely you still need to suck antifreeze into the heater, shower and ballast systems, right?


Thanks in advance. 

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Can you? Yes.

Should you? No.

The block is closed cooled, but the manifolds, and transmission are still raw water cooled. 

Yes there is still a raw water impeller that could be damaged running dry.

The heater is on the block coolant loop, so you dont need to blow it out.

You will need to winterize the shower and ballast tanks.

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Concur with @COOP. One way to think about running only with the "closed cooling" is the heat isnt actually leaving the boat.  That's what the raw water does (transport waste engine heat to the surrounding water). So raw water cooling the manifolds is what prevents the whole engine from cooking.

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