Engine L6, Engine Size 3.9L/235 Engine Family GM inline 6-cylinder Original equipment manufacturer approved. Trivalent metal plating has superior anti-corrosion and anti-seizing properties Shorty Spark Plug: No. Resistor: Yes. Manufacturer Heat Range: 4 Sold In 6 Pack NGK V-Power spark plugs offer economical performance for nearly any automotive application-and they're the only plugs with NGK's V-Groove technology.