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Influence - Harley "Evolution" running from 1984-1999. This Engine marked a big redesign for Harley Engines changing the head design considerably from previous itterations. (www.factoryfat.com, 2002)

Harley-Davidson unveils the V² Evolution engine on five models including the all-new Softail. The result of seven years of development, the Evolution engine produces more power at every speed, runs cooler, cleaner and is oil-tight.