Seen this happen before, used to be common in the 70's, 80's. Not sure what caused it, other than not keeping the antifreeze changed, seen it caused from not having any antifreeze in warmer climates...
What happens is sediment builds up in the bottom of the water jacket in the block. Once it's in there nearly impossible to get it out. It forms something like a brown, acidic paste, it's terrible for freeze plugs. Pull out a leaking one and see a corroded line across the inside of the plug where the sediment was in contact with the plug. When the engine overheated, the boiling turned some of it loose.
I haven't heard of a strainer for heater core protection, be sure it can handle the heat!
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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