1970 Austrian 1000 km

The 1970 Austrian 1000km was an endurance race held at the Österreichring, near Zeltweg, Austria on October 11, 1970.

[1] John Wyer's factory supported Gulf-Porsche team won again, they had won 7 of 10 races in the season (in addition to this race, Daytona, Brands Hatch, Monza, Targa Florio, Spa, and Watkins Glen) and on top of that, the Porsche Salzburg prototypes won 2 more races (Nürburgring and Le Mans).

Jo Siffert and Brian Redman won their third race together with their Porsche 917K; they faced intense opposition from 2 factory teams with revised and improved cars- Jacky Ickx and Peter Schetty in a Ferrari 512M and later in the race, an Alfa Romeo T33/3-71 driven by Andrea De Adamich and Henri Pescarolo.

But Porsche also had made revisions to their machines- they brought to the scenic Österreichring new 5-liter engines for 3 of their 917K's.

But new rules for 1972 banning engines in prototypes larger than 3 liters made the 917's and 512's (the 512's were only run by Ferrari for this year; they decided to build a 3 liter car, the 312PB for the new regulations) obsolete, and Porsche pulled out of endurance racing and did not return until 1976.