Description: All models. 5.0l, 5.7l. S-series. 4.3l. Express, savana. 5.0l, 5.7l. Without 7.4L, gas, 4.3, 5.0, 5.7L. 4.3L, all. Express, savana. 4.3l. 1/2, 3/4 & 1 ton, 1996 new style, without 7.4L, gas.

Description: All models. S-series. 4.3l. S-series. 2.5l. 4.3L, efi. 5.7L. Helps provide a leak-free seal Allows exhaust pollutants to enter the engine for re-burn Helps the engine emission system operate properly This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors