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Speed-Pro now offers 16cc, dished forged pistons for a 5.7-inch rod 400, but at the time we did this story, the pistons were not quite ready for production. Dutweiler’s machine shop milled an 11cc dish in the 2517 flat-tops to lower our compression for the iron heads. What look like ribs in the perfectly flat dish are actually tool marks left by the CNC machine. View Related Article
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