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There is no problem at all with blocking off the radiator. As Neil said, grill blocks (on the exterior) are superior as they help with aerodynamics. But, radiator blocks are incredibly easy and will help with warm up. Just make sure you don't block off too much, and make sure you remove it when it starts to warm up. If its blocked off too much or gets too warm up you do run the risk of overheating, so keep an eye on your coolant temperature.
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