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Yep. Pull the plugs on all the cylinders and use a shop vac and a hose small enough to get ALL of the coolant out of the cylinders. Spray or pour some WD into all of them and rotate the engine over by hand to coat the cylinders to protect against rust. Be sure to drain the coolant too. There is a drain plug on the block down on the lower side near the Air/Oil Separator. This will get the coolant that is stuck behind the thermostat and keep coolant from seeping into the cylinder past the head gasket.
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