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Cars were not limited by weight and could use naturally aspirated or turbo-charged engines fixed at the front of the car - but the cauldron of competition soon moved it on. Resoure: http://atlasf1.autosport.com/timeline/50s.html
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Engine specs amended to allow 750 cc maximum engine size with a compressor or 2500 cc for a normally aspirated engine. Engines limtited to 2.5 litres. Still No weight limit Resource : https://en.wikipedia.org/wiki/History_of_Formula_One_regulations
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The use of commercial petrol became compulsory and alcohol-based racing fuels were no longer permitted,a reduction in the length of races from 500km or three hours to 300km or two hours. Resource: http://atlasf1.autosport.com/timeline/50s.html
http://en.espn.co.uk/f1/motorsport/page/2825.html -
Few changes started out in beginning of the '60s. However, with the advent of a new breed of innovative and forward thinking designers, and the beginnings of drivers striving for safer racing conditions, the number of rule changes made began to accelerate as the new decade came to a start Resource : http://atlasf1.autosport.com/timeline/60s.html
https://en.wikipedia.org/wiki/History_of_Formula_One_regulations
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