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Fran, This one's cracked in between each liner bore in the web at the top, and in the web area at the bottom, with the crack in the center bottom web continuing on down into the main bearing upper support. My understanding from others is that the cracks start first in the top webs, then progress to the bottom webs. That's when you lose coolant into the oil; the liners/sleeves aren't adequately supported. The lower center web crack then progresses on down into the main bearing support. I hear that each "progression" of the cracks from top webs, to bottom webs, and into the center main, is more costly to repair if you have the block welded. To inspect your block, I would start by cleaning the top deck of the block, concentrating on the "narrow" area in between each cylinder. You should be able to see hairline cracks on top of the deck if the block is cracked. If cracked, then continue to check the upper webs, then on down into the lower webs, and last, the upper main support. If you find nothing, then I would still take the block to a machine shop to have it magnafluxed to be sure that there aren't cracks you can't see, especially if you're going to put some reasonable money into a rebuild. Al
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