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I feel the need to chime in on this again.
Your engine is designed to run at a specific temp. The parts are designed/sized so that thermal expansion of the parts lines the parts up optimally at this temp. Furthermore your engine operating at the temp the thermostat sets breaks in the parts so that they work together better at the temp the thermostat sets. Operation outside of the ideal temp defined by wear and design causes excessive wear on engine parts that degrades performance/economy.
If your grill block in any way changes your coolant temps you are wearing out your engine.
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