In the opinion of many an aficionado, the 904 was the greatest road-going Porsche of all. It certainly set the pattern for a whole generation of racing Porsches, but its beauty cloaked the fact that it wasn’t as aerodynamically perfect as it might have been, and it was overweight, too. Moreover, as caution dictated that the intended but untried 911-based engine be scratched, it used the aging but reliable 180 horsepower Carrera fourcam unit. The 904 was undeniably tough, with its svelte glass fiber body bonded to a sheet steel double-box chassis, and it was certainly effective enough a performer to put Porsche back in the hunt for two liter class domination.