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6 For the reciprocating assembly, we went to Speed-Pro and its line of Power Forged replacement pistons. These pistons come as matched-weight sets and feature an antifriction full-skirt coating. These L2482F slugs are direct replacements for the original Hi-Po piston, but will need fly-cutting if youre using larger valves like we are. We also tapped Speed-Pros parent company, Federal-Mogul, for bearings, and subsidiary Fel-Pro for a complete gasket set.