Total rod and piston weight is approximately "1 kilo" says Ford. Conserving this weight was especially importantly in the Coyote because less reciprocating weight meant less counterweight diameter on the crankshaft, a crucial packaging concern in the crammed Coyote crankcase. The ring package is 1.2 mm x 1.2mm x 2.5mm and weighs just 24 grams. The top ring is moly-coated and sits 1mm lower on the piston than in the 4.6 for increased durability. Because of the 4.6 rod center-to-center length in a 2.8mm (0.110-inch) longer stroke, the piston height packaging is a little tighter.