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the thing about the 80's, was they just bored stock 74 cyl,3 & 7/16 & took them out to 3&1/2.that meant over bores were limited Al
I have a 1978 FXEF 80. Eighties were made at the end of the 78 production year on some models.
You could also buy a "kit" from HD to convert your bike to the new 80 inch motor. I got one and converted my 1975 engine. The 74 didn't need rebuilt at all but I wanted the "monster" 80". All my buddies were mighty impressed. Funny how now an 80" is thought of as being small.
Lets don't forget the "Flat Head 80" motors" from 1930-1936. The original 80" motor. Which was replaced by the Knuckle in 1937.
The 80" Shovelhead motor was introduced midyear in 1978 on the 75th anniv. model Electra Glides. We bought new police bikes in 1979 that were 74" but by 1981 even the police models were 80" as a standard.
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