GM LS Rear Cover Alignment Tool Fits GM LS Engines with Seal in Rear Cover Mr GasketThe timing cover and rear cover on GM (General Motors) LS series engines don't have any dowel pins to ensure correct alignment to the centerline of the crankshaft and this often leads to annoying leaks at the front damper seal and rear main seal. These special alignment tools center the front or rear cover when it is installed, and allow an easy way to install the seal by lightly tapping on the tool with rubber mallet. Choose from three styles of