This manual covers the Porsche 928 and 928S models from the first generation, produced between 1978 and 1986. The 928 represented a significant departure for Porsche, designed as a front-engine, rear-wheel-drive grand tourer, distinguishing itself with a V8 engine and a rear-mounted transaxle for optimal weight distribution. The 928S, introduced for the 1980 model year, featured increased engine displacement and performance enhancements. These vehicles are recognized for their aerodynamic styling, advanced engineering for their era, and unique positioning within Porsche's lineup, aiming to blend performance with comfort.

This technical data document serves as a comprehensive reference for dimensional specifications and tolerances, crucial for manufacturing, restoration, and quality assurance. It details body dimensions, component tolerances, chassis measurements, interior space, engine bay clearances, and wheel and tire fitment parameters. The manual also outlines procedures related to body alignment and panel replacement fitment, ensuring adherence to original equipment manufacturer standards. Its highly specific technical data is intended for restoration specialists, bodyshops, and Porsche enthusiasts focused on preserving the precise build quality of these iconic vehicles.