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What temperature should a Chevrolet 350 operate at?

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Ideally 195 degrees. Any cooler and incomplete fuel combustion. However as high as 210 is ok. This assumes a 50/50 mix of antifreeze and distilled water. Yes distilled water. You want to screw up a $10.00 gal of antifreeze because you were too cheap to buy a $1.00 gal of distilled water. Advantage, no minerals or other chemicals in the water... Also recommend a 9 lb. Closed system radiator cap.

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