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When your block is returned from a machine shop, check to see if the top edge of each cylinder has been chamfered (machined to a slight radius or 45-degree step) rather than displaying a sharp 90-degree edge. A conical stone chamfers and deburrs the edge of the cylinder, making installation of the pistons easier.
396ci Chevy Big Block - Engine-Building Tips

When your block is returned from a machine shop, check to see if the top edge of each cylinder has been chamfered (machined to a slight radius or 45-degree step) rather than displaying a sharp 90-degree edge. A conical stone chamfers and deburrs the edge of the cylinder, making installation of the pistons easier.  View Related Article

 

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