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Grille blocks increase the temperature of the coolant leaving the radiator. Exit coolant temps vary greatly from summer, around 120 degrees, to temps below freezing where the temp can be as much as close to 100 degrees colder. That cold coolant sucks heat out of the engine when it enters the block, and the restriction to flow in very cold temps means it is moving slower in its circuit.
In severely cold temps you can probably keep the engine cool with just the heater core.
Less heat dissipated into the atmosphere means more heat energy to push the pistons for useful work.
Another factor is grille blocks tend to help aerodynamics.
regards
Mech
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