CHEVROLET 383 ROD 5.700 DCUP +18CC 2V KB HYPER PISTON SET

The United Engine & Machine KB102.030 is a set of eight hypereutectic pistons designed for SB Chevy 383 engines with a 4.030-inch bore. These pistons feature a dish-style head with an 18cc volume and a compression height of 1.433 inches. The low-expansion 390 alloy with 16% silicon allows for tighter piston-to-wall running clearance, making them suitable for high-performance marine, drag race, circle track, street, or towing applications.

Key features include fully machined head and valve reliefs, CNC-machined pin bores, an accumulator groove for improved ring seal, machined oil returns, and diamond-finished skirts. The wrist pins and spiral lock rings are sized at 1/16 x 1/16 x 3/16 inches. Compression ratios vary depending on the cylinder head volume: 10.3:1 for 58cc, 9.9:1 for 62cc, 9.7:1 for 64cc, and 8.7:1 for 76cc heads.