If it's a ford cologne series engine the freeze plugs will be right above the oil pan gasket I believe on the exhaust side of the block.
I make heaters all the time using a couple of pipe pieces sized for the water heater element in a "T" configuration. I also place the controller directly over the elements end so if it goes dry, the controller tends to shut it off. Got 3 in the ranger including one powered poorly by 12 VDC.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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