Allstar Aluminum Camshaft Thrust Button for Small Block Chevy with Early Model Flat Timing Cover features a camshaft thrust button. It fits small block Chevy engines with an early model flat timing cover. It is made from quality aluminum material. The cam buttons limit lateral movement of the camshaft in engines without cam thrust plates, and reduce friction for free horsepower. The machining of the cam sprocket may be required. It is backed by a 90-day limited factory warranty and sold individually.