The SEFAC-Ferrari works team returned to Le Mans after a year's absence, with the new 312P prototype, a design strongly akin to the Can-Am 612P. It ran a 3-litre V12 engine based on the Ferrari Formula 1 engine, developing 430 bhp. Two cars were entered, for former race-winners Chris Amon and Pedro Rodriguez, partnered with hill-climb specialist Peter Schetty and David Piper respectively. The North American Racing Team (NART) once again had three different options entered in the Sports category: its 1965 race-winning 275LM car was back, with a new 365 GTB/4 in the over-2-litre class, and a Dino 206 S in the under-2-litre class.