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The JE pistons and pins are weight-matched to within 1/2 gram of each other box stock. The same can be said for the Eagle H-beam rods. The .030-over JE piston, pin, and Eagle rod combination was 446 grams lighter than the stock piston, pin, and rod. The balanced and lighter reciprocating assembly was stronger, would rev-up faster, and make more power than the stock parts.