A modern engine with a retro look. Xzotic™ engines are RevTech® engines that have been assembled using our popular Xzotic™ generator-style cam covers, distributors and either Panhead or Knucklehead rocker covers. Each engine comes completely assembled, ready to bolt into your bike. They come in polished, black, and natural finishes. Polished and black engines come with highly polished Xzotic™ components, while our natural comes with semi polished for a tougher look. Compatible with Original Equipment and custom frames that accept Evolution® engines.