Description: 4.3L. Astro, Safari. 6 cylinder, all. 2003-14. 8.1L. 1/2, 3/4 & 1 ton, 1996 new style, gas engine, 4.3, 5.0, 5.7L. Designed to restore your vehicle's engine cooling system This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors Original equipment parts are designed to work with your GM vehicle safety systems -- aftermarket replacement parts may not meet the same OE safety regulations, depending on the part type