MR. GASKET GM LS TIMING COVER ALIGNMENT TOOL # LSTC1MR. GASKET GM LS TIMING COVER ALIGNMENT TOOL # LSTC1 The 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 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