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The Mahle pistons use wire locks, which are generally better than spiral locks, which can damage the piston if the engine goes into detonation. With new engine builders, installing locks can be quite frustrating and even lead to scratched pistons if you try to get the locks into place with a screwdriver. Scratches and gouges not only look bad, but they can also create stress risers which will weaken the material. A great alternative is the Lock-In Tool, which makes installing pin locks a breeze. View Related Article
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