NPR / NPR-HD 5.7L 1999, Engine Full Gasket Set (C5.7-A) by Enginetech. The Engine Builder's Source, can locate the right part for nearly any rebuild application. Offering a full line of internal engine parts for domestic, import and high performance applications, Enginetech products are manufactured only in high quality facilities with ISO, QS & TS quality systems in place. Developed to ensure excellent performance, this product is made in accordance with the most stringent standards to meet or exceed your expectations.