through their industrial engines division (the 127V unit), with smaller pistons and barrels, which reduced the capacity to 1600cc. As with any formula, Formula Super Vee progressed through a number of changes during its life. Initially, for example, the cars ran without wings and used drum brakes at the rear. Later the regulations allowed the use of 8-inch rear wheels, rear disc brakes and 34 mm exhaust valves (1973) and then rear wings (1975). Since slick tyres had yet to be introduced into racing, the cars ran with treaded racing tyres, such as the Firestone "No-DOT", but later moved onto slicks. The original regulations specified a non-Hewland gearbox and cars ran with fixed ratio VW boxes. In Europe a company called Metso began building Hewland-like boxes which provided the ability to change ratios to suit each circuit and exploited the wording of the regulations, which had simply banned Hewland boxes rather than explicitly specifying the fixed ratio VW box. Once the cars started to use Metso boxes the regulations were changed and Hewland Gearboxes were also allowed. This change, combined with start money being offered by Hewland to drivers using its products, effectively put Metso out of business, although the company did build boxes for other formula cars such as Formula Fords. Much later, engine regulations were also opened up, allowing fuel injected water-cooled engines from the Volkswagen Golf (or Rabbit as the Mk1 was known in North America). The water-cooled engines inevitably replaced the air-cooled, which were rendered uncompetitive, and many air-cooled cars were converted to accept the water-cooled engine. Some constructors, such as Lola, offered "conversion kits" which allowed the fitment of the Golf/Rabbit engine to earlier air-cooled chassis. The SCCA in the USA did allow 1700cc air-cooled engines towards the end of the air-cooled period, to remain competitive while the water-cooled cars joined the grid. Ultimately the most developed version of Super Vee was to be found in the USA, since they continued with a Super Vee series years after the formula had died away elsewhere. Indeed, by late 70s Super Vee in the USA had become the feeder formula for Indy cars, referred to as the "Mini-Indy" series. This series was run in conjunction with the much older VW-Bosch "Gold Cup" for Super V. This series lasted until 1990 and, unlike the oval track USAC Mini Indy Series, was a road racing series. Each series crowned