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Even a basic rebuild of the short-block can include updates. For example, we had ours fitted with hypereutectic pistons instead of either the basic cast versions used in standard factory small-blocks or the forged slugs found in some high-performance engines. Both are available, but the hypereutectic—found in nearly all factory-produced engines manufactured today—offers more strength than a cast piston and can be fitted to the cylinder walls with close tolerances due to its minor thermal-expansion rate. Forged pistons, though stronger, expand more than cast or hypereutectic slugs, and therefore must be installed with more clearance; this often results in noisy operation, particularly during cold starts.
Neo-Retro 327 - Modern V-8 Power with 327 Looks

Even a basic rebuild of the short-block can include updates. For example, we had ours fitted with hypereutectic pistons instead of either the basic cast versions used in standard factory small-blocks or the forged slugs found in some high-performance engines. Both are available, but the hypereutectic—found in nearly all factory-produced engines manufactured today—offers more strength than a cast piston and can be fitted to the cylinder walls with close tolerances due to its minor thermal-expansion rate. Forged pistons, though stronger, expand more than cast or hypereutectic slugs, and therefore must be installed with more clearance; this often results in noisy operation, particularly during cold starts.  View Related Article

 

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