The toughest piston in the world is useless if the wrist pin gives up the ghost. Here is a breakdown of what the wrist pin does, why they fail, and when to upgrade them to improve the strength of your engine combination. It has been said that the piston and connecting rod are the most tortured parts in a performance engine. Few engine builders dispute that notion, but what about the less glamorous piece of steel that mates them together through thick and thin? In a sense, the wrist pin ...