Starting at the top, your 110 heads are carefully ported to increase velocity and are assembled with our Step-Lock guides, flow-enhancing valves and performance springs. Features Designed specifically for high performance Sport Touring Adds up to 140 HP Up to 60% more power over CVO engine Purpose Built designed for power and durability Zipper's engineered engine kit designed with calibration and exhaust system Available for Twin Cool and Air Cooled Engines. The item "Zippers Muscle Big Bore Cylinders CVO SE Twin Cams Kit 110 113 Harley 07-17" is in sale since Tuesday, December 15, 2020. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle Parts\Engines & Engine Parts\Big Bore & Top End Kits".The seller is "americanclassicmotors" and is located in Zieglerville, Pennsylvania. This item can be shipped worldwide.