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The Evo is a engine and a term as you have EVO sporty as well. But for the EVO 80 inch 1340 Really 81.65 ci and 1338 if you do the figures. But it was first put into production as a whole in 1984 as this was the first year of the softail, as well so the , by 1985 the rest of the HD line up followed suit with the evo.
Making a whopping 52-55 hp ( figures varied) and at a 8.5.1 compression is down from what the shovel had was making in the 65 hp range, and with less compression. However the evo did not have all the issue that the shovels had and the shovel head had come to the end os its time.
I think myself that the evo really got started when the shovel head go tthe evo style lower end in 67. Or there abouts I have seen a few models that should have had shov flat side lower with the evo style and vise versa. The early shovels with a evo lower did get teh nick name shovevolution ,. I think that the mis matched cas'e stemmed fropm Dealers having case on the shelf. As for EFVO sportys there where in the late 84 to 85 range. Some being a real mix match of parts as HD was using up all the old stock parts.
Hmmm a bit much maybe but I bet eh will remember EVO Have a great day.
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