Allstar Roller Bearing Style Camshaft Thrust Button for Small Block Chevy Timing Cover features a camshaft thrust button. It is a roller-needle bearing style and fits small block Chevy engines. It is manufactured from quality steel material and has high quality roller needle bearings. The cam buttons limit lateral movement of the camshaft in engines without cam thrust plates. It helps to 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.