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After the piston tops got their ceramic coating, the piston skirts got a graphite-based coating to minimize friction and heat as they travel up and down in the bores. The coatings are applied with a basic airbrush, and are Tech Line products. Note the ring grooves are taped up to prevent any of the coating from getting into them-the clearances in this area are crucial and the ring lands should never be coated. View Related Article
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