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We were particular about the quality of machining for our 408-inch stroker. Doing it right requires the right equipment. JGM is equipped with this Rottler milling machine with a block indexing fixture, which ensures the decks are cut parallel to the crank centerline and indexed at the correct 45-degree angle to the centerline established between the crank and the cam bore centerlines. The piston, rod, and crank assembly is measured and the block then decked to give a zero deck height.