1972 350 Chevy Pickup Engine
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With the main caps installed and torqued to 70 ft-lb, the No. 2, 3, and 4 main bore diameters measured 0.0005 under the acceptable minimum spec. A tight bore can reduce the oil clearance and lead to premature main-bearing wear or outright failure. So Sal Alcarez loaded the block onto the Sunnen CH100K line-hone machine and corrected the issue. After three light passes, all five main bores measured 2.6410 inches on the nose. The acceptable range is 2.6406-2.6416 inches. View Related Article
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