1972 350 Chevy Pickup Engine
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With the crankshaft removed, we inspected the main bearings and block saddles for obvious signs of damage: deep grooves, scratches, or discoloration. The nasty, dark region shown here on a 454 big-block is clear evidence of a spun main bearing. Badly discolored main caps are always tossed and replaced. While block damage like this can be corrected, severe localized heat cycling tends to breed cracks in the saddles and webs. Anything can be fixed, but it gets costly. So unless it's the original block to Duntov's personal '57 Corvette fuelie, think about a replacement. Fortunately, our 350 was shiny and happy in this department. View Related Article
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