Porsche’s 2.8 911 RSR Porsche needed to build 500 RSs in 1973 to get the RSR homologated for Group 4 racing. They were so popular that the company eventually built 1580 units. Consequently, the RS is almost common compared to the RSR that came out of the factory winning the...
Background The original 917 was developed by Porsche beginning in 1968 in anticipation of changes to FIA homologation rules allowing low-production prototypes to contest the 5.0-liter class of World Sports Car Championship competition. The flat-12-powered 917 claimed back-to-back victories at Le Mans while helping Porsche claim the 1970 and 1971...