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A relatively inexpensive method to ensure the racing engine's longevity, especially since it'll be on nitrous for each pass down the track, is filling the water jackets with cement, which prevents the cylinders from deforming. In this case, Thomson Automotive used Hard Blok jacket filler, which is a cement-based product designed for use in racing engines. Its coefficient of thermal expansion is the same as iron engine blocks. Thomson leaves enough room in the water jackets to allow water to get to the heads.