Just replaced the camshaft in your LS engine, wanting to replace the camshaft retainingplate to stop the camshaft from wandering around? This Aeroflow Performance camshaft trust plate is designed to suit all GM LS engines and replaces the genuine GM part number GM12589016. These solidsteel plates protect your engine investment by returningyour timing back to the desired specifications. Properpositioning of your camshaft is crucial. They feature the O-ring seal that is moulded onto the back of the plate with a new Viton O-ring included. These have counter sunk bolt holes and the one time use T40 Torx Bit tapered bolt is included and also soldseparately (AF463-52). The required torque is 11ft/lbs (14.91Nm).