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I remember there was an article in the Restorer many years ago (1970s?) where a detailed temperature test was done on a Model A engine. It was titled "Nothing Happens in No. 1 and 2". As part of the test, the author bored and tapped a hole in the back of the block and installed a copper pipe routed to the inlet casting on the side of the engine. This would bring cooler water from the radiator to the back of the engine. Sure enough, this stagnate flow area was eliminated with corresponding cooler temperatures. The only problem was it looked crappy, ruining the look of an original engine! It is one of those improvements that isn't necessary for the present owner. The car is going to last longer than we do with good maintenance and driving habits. Ed