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A radiator block will normally go behind the grill and in front of the radiator in order to limit the airflow through the radiator keeping the engine temp up, but doesn't do much to force the air up and over the vehicle, which is the main purpose of a grill block, which goes in front of the grill and will also restrict airflow to the front of the radiator, but will still allow some cooling airflow.
So a grill block will generally show an aerodynamic improvement, but a radiator block will not.
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