What does ab stand for on a e9te-ab on a 460 engine?

In the context of an E9TE-AB engine code, "AB" typically designates a specific variant or calibration of the engine, with "E9TE" indicating the engine family and model. The "AB" suffix often refers to particular features or specifications that differentiate it from other versions, such as emissions standards or performance characteristics. These codes are used by manufacturers to identify and manage engine variants for production and service purposes.