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This engine has a closed cooling system augmented by raw water pumped through the engine block. I've changed the coolant with fresh 50-50 prestone. The raw water side has an attachment for a garden hose to flush in clean water. After flushing, I'd like to attach a pump to add -50 pink stuff (probably 5-6 gallons). Using the hose connection on the engine I'd like to pump the pink stuff throughout the block. Will I be able to reach all places in the engine block where raw water would reside? I haven't found the drain plugs on the engine block itself so I was hoping the method proposed will do the trick.