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Here is the custom-forged Mahle piston with a 15cc dish designed for the 598ci stroker kit. The dish includes valve reliefs designed to clear our huge M-6049-C460 valves. In its most basic form, this is a big-block Chevy piston, but Mahle has relocated the wristpin for our big-block Ford. This is how you get nearly 600 ci from a 385-series Ford.