Enginetech P3081 Flat Top Hypereutectic Pistons for 1997-2004 Chevrolet 5.7L LS1 EnginesCoated Skirts; Press fit Pins; 1. 5 1. 5 3. 0 MM ring package Enginetech pistons have superior size and weight grading within each set. Most Enginetech pistons are decked 0. 010 to 0. 020 to compensate for oversized bores and head deck milling. Enginetech pistons are manufactured with state of the art materials to match OE requirements. We offer cast aluminum, hypereutectic, and forged applications. Treatments such as skirt coatings, anodized heads &