My entire engine set (over 120 images) www.flickr.com/photos/gordoncalder/sets/72157612757443903... In production 1984 - 1999, and still in production for the Sportster. The Evolution engine (popularly known as Evo or Blockhead) is an air-cooled, 45 degree, V-twin motorcycle engine manufactured by the Harley Davidson Motor Company. It was made in the 1,340 cc (82 cu in) displacement for Harley-Davidson Big Twin bikes, replacing the obsolete Shovelhead engine, until 1999 when it was replaced…