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An EVO, or block head is the motor that real bikes come with. The twin cam motor is the current motor, and is the motor preferred by most women of child bearing age.
Gotta agree with the praises for the Evo. It saved the MoCo's bacon, was a quantum leap in terms of performance and reliability compared to earlier engine designs while still retaining the true Harley experience in looks and feel.
My only gripe is with the leaking rocker box gaskets which is real common with this engine, but it's a pretty easy fix if you are half-way handy with a wrench and use some high-quality gaskets.
At the end of the day, I think this engine will be considered a hallmark in Harley history.
Slideshow: Jason Momoa's latest restoration project blends 1920s Harley-Davidsons with modern electric technology, creating some of the most unusual hybrid motorcycles ever built.
Harley-Davidson Fat Boy Becomes a Dark, Decepticon-Inspired Custom
Slideshow: Killer Custom's latest build relies on styling changes rather than performance upgrades, giving the cruiser an entirely different personality.
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Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.