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To work with our selected combination of camshaft, the pistons requiredcustom machining of the intake valve relief to an additional 0.070-inchdepth before installation. Here the piston is fitted to the bored,decked, line-honed, and indexed factory 427 block. Dougan's Machine, inRiverside, California, handled all the machining and balancing. Ringsare Speed-Pro's excellent plasma-moly units, file-fit to the bores.