Block heaters were a necesity back in the day. They were used to help in starting the engine on a cold day (below freezing) When I was coming up I could not start my old worn out 318 Detroit without the aid of a block heater and ether!! Todays engines are built different and they will preheat the air in te intake before starting. If all is in good shape then a block heater is no needed. That said, I would use it in cold climates to help reduce cold engine wear on start up and to help get the engine at the proper temperature faster.
Wick
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