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A grill block will help slightly because even if the coolant isn't flowing through the radiator, it is still transfering heat out through the engine block itself at a much slower pace. By blocking the grill you also slightly reduce the amount of air passing over the engine itself, this will help even if it is only very slightly.
Using a hot air intake will help as well as the engine will be sucking in warmer air with each revolution instead of colder air that contributes to cooling as well.
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