The Hitachi SIDI system used on the 2010 LF1 3.6L V6 and LAF 2.0L ECOTEC utilizes clips and plates to secure each injector to the fuel rail prior to installation in the cylinder head. Due to the extremely high pressures used in the SIDI system, installing these clips and plates correctly is critical to ensuring leak-free operation. Each clip must be installed square and straight onto the rail/injector assembly, with the least spread possible. Over-spreading due to misinstallation may lead to clip failure. Once the rail, injector and clip are assembled by hand, the rail/injector assembly may be placed into a vice for stability. The clip is placed into the magnetic base of GM-49247, and GM-49247 is placed around the rail over the injector. The handles on GM-49247 are closed to seat the injector clip. Once the clip is installed, the balance of the injectors can be installed in the same way.