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Clois There was an article in Hot Rod or Car Craft about filling a block with hardbokt. You can run a block on the street if the fill is below the freeze plug level without an problem. The higher the fill the less coolant needed. The heads and the top 2" of he bore in the block are the most important. You can get that stuff out with a dremel tool if you have the time. A local racer told me he drills holes in it down the passages and sends the block to a vibration table place that causes the hardbloc to fall apart without damage to the block. I would check these block for how much cylinder wall is left first, if 30 over it might not be worth it. If stock bore or 10 over, buy 2 and you have a winter project. Hope to see you at R&G in Sept. Rick Lake
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