Ensure peak engine performance and emissions compliance with this set of 10 smog plugs designed for 300 CID L6 4.9L engines from 1984 and up. Engineered with precision and manufactured from alloy steel zinc coated, these smog plugs provide exceptional reliability and longevity. Ideal for replacing worn or damaged plugs, this product is crafted to meet the rigorous standards of the automotive industry. Trust in American-made quality to keep your engine running smoothly.