In my Pulling tractor, I put sand in the block instead of the water. The thing is, you can heat them up, but running alcohol the heat does not have much effect on the performance. Just have to let them cool off by themselves. NO water! That will crack something. I used a Blower turning HARD! Had to use copper head gaskets to keep the pressure in. They would leak coolant, so no way to water cool. But not needed in that app.