I've seen that in engines I had no reason to believe had ever had Bars Leak in them.
I think it's a mixture of iron oxide, casting sand, and hard water deposits that settles in the bottom of the block. Apparently it is quite corrosive. I've seen the back side of freeze plugs eaten away on the bottom where they were in contact of it, still looked good on top.
It is good to get all of it out you can!
Ever use any of these? They are great where you can't get a swing with a hammer, permanent too!
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Today's Featured Article - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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