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The pistons are also weighed to find the lightest one. When it's found, the pistons are machined to match that weight. There are small pads inside the pistons where weight can be removed.
Building a Better Buick, Part I

The pistons are also weighed to find the lightest one. When it's found, the pistons are machined to match that weight. There are small pads inside the pistons where weight can be removed.  View Related Article