Lock Cylinder in Chevrolet Nova vehicles specifically referred to as the Ignition Lock Cylinder is important in that it enables the key to be inserted and turned in order to start the engine. This is usually located in the ignition switch that is fixed on the steering column. If the correct key is inserted, it allows engagement of the ignition and the fuel injection in order for the vehicle to start. Chevrolet Nova has employed a number of design types of Ignition Lock Cylinders throughout the years, having had the older dash mounted designs earlier and the newer mandatory column mounted designs that were prompted in the 197's. These newer designs were put in place to improve on the security of vehicles as well as curbing the incidences of theft. However, there are still problems that might occur with the Ignition Lock Cylinder for instance wear and tear could hinder unfettered access to the vehicle.