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The block is a used part that formerly powered one of Shaver's many sprint car efforts. It's already shown it's capable of supporting more than 600 horses for many miles. The final bore size will be 4.185 inches. The only major mod to the block is the addition of roller cam bearings to reduce friction. Not normally seen as a street modification, roller cam bearings require special camshafts to fit the smaller inner diameter. View Related Article
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