【FITMENT】Compatible with GM 2.0 2.2 2.4 Ecotec DOHC. Intake Valves Part OE Number: 12622329, Exhaust Valves Part OE Number: 12615936 【OUR ADVANTAGES】Flow control: Precisely adjust air flow, increase power by 15%; Carbon deposit resistance: Special coating reduces carbon deposit adhesion, extending cleaning cycle by 3 times. Perfect fit for original car mold without additional modification 【DURABILITY】Valves are Tufftride coated, and extra wide valve face to accommodate variations in worn valve seats (easier to lap).Stellite #1 coated (50-58 HRC) on the tip of the valves (extra hard for the tapping of the rocker arm tips) to prevent "mushrooming" 【PACKAGE INCLUDE】8 Intake Valves: 1.36inch(Head) x 0.24inch(Stem) x 4.03mm(Length); 8 Exhaust Valves: 1.18inch(Head) x 0.23inch(Stem) x 3.95mm(Length) 【OUR SERVICE】If you have any questions about the compatible models or after-sales problems, please feel free to contact us by email, we will provide you with the most professional and timely service. Note: *Valve seats need to inspected and touched up from a machine shop if heavily pitted. Otherwise you need to lap with the new valves to the old seats using some lapping compound. Guides must be measured for excessive play / wear. Guides will need replacement before attempting to cut or lap valve seats.