Forged Dish Piston Set, 4.130" Bore

The Diamond Pistons 11557-R1-8 is a premium piston set engineered for Gen III/Gen IV LS engines, built to withstand the demands of high horsepower, nitrous, and forced induction applications. Constructed from durable 2618 material, these pistons feature a dish volume of 25.6cc, a bore size of 4.130 inches, and are designed to pair with a 4.000-inch stroke and a 6.125-inch rod length. These pistons offer several performance-enhancing features, including 3D milling on the crowns for a ready-to-install finish. For enhanced durability and reduced friction, they come with a Moly skirt coating and utilize offset pins for quieter operation. The set includes a premium 1.2mm/1.2mm/3.0mm ring package and 8620 .185w wrist pins. They have continually updated their machinery and expanded their inventory to offer state-of-the-art products with a strong commitment to customer service and quality. These pistons are rated for ratios figured with a .040 head gasket and a top ring down dimension of .250”.