Front & Rear cover and oil pan alignment tool set perfectly compatible with for series engine 4.8 5.3 5.7 6.0 LS1 LS3 LS4 LS6 LS7 L99 LS4 LS9 LSA LQ4 LQ9 L76 L92. High Performance - This front and rear cover billet alignment tool kit helps easily align the front and rear engine covers to make sure the cover is centered, allows you properly install the seal to avoid leaks. In additional, can center / align the cover on the front seal or locates on the inside diameter of the seal bore in the cover without the seal installed. A centered cover means less of a chance for a seal to leak. Powerful Functions - This tool mimics the balancer and oil pan to provide critical alignment of the oil pan and front cover, designed to be used in conjunction with the front cover alignment tool. For engine, the oil pan is a stressed member and adds to block rigidity. Due to this reason, it can't simply be slapped in place, you will have to aligned the front and rear engine covers to the oil pan carefully. Superior Material - Made from top quality Aluminum for great strength, prevent and rust, impact resistance, tight tolerances for perfect alignment, ensures long term reliable service. Perfect for engine builders and mechanic to replace the front or rear main seal for series engine. Colour:Silver Material:Aluminum alloy Package Contents: 4 x Mounting Screws 1 x Oil Pan Billet Alignment Tool 1 x Rear Main Seal Alignment Tool 1 x Front Cover Billet Alignment Tool Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.