Classic Cubes From An LS1 Part 1
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The factory pistons (left) are a hypereutectic design featuring apressed-pin and no valve reliefs. Antiscuff coating is present on theside skirts, but no thermal barrier coating is applied to the pistontop. The piston weighs 434 grams and utilizes a 1.5mm moly top-ring, a1.5mm cast-iron ring, and a 3mm stainless oil ring. Although it is agood factory piston, a weak spot is the piston crown, which is subjectto destruction from detonation. The Wiseco forged-aluminum pistons aremanufactured to take upward of 750 crankshaft horsepower. They feature afull-floating pin, valve reliefs, and a 14cc reverse dome. Athermal-barrier coating protects the piston top, while an antiscuff,antifriction coating runs the length of the skirt. The piston is custommade to fit the 4.160 bore size, and the pin location has been raised toreduce compression height to accommodate the longer stroke and rods.This piston uses a file-to-fit Total Seal 1/16-inch ductile plasma molytop ring, a cast-iron 1/16-inch second ring, and a standard-tensionstainless oil ring that measures 3/16 inch. Weighing in at a scant 420grams, this piston is ready to rock. View Related Article
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