The Shovelhead engine is a motorcycle engine that was produced by HⒶrley-DⒶvidson from 1966 to 1984, built as a successor to the previous Panhead engine. When the engine was first produced, the Shovelhead had a shallower combustion chamber, larger valve drop for both intake and exhaust, better porting, and stronger valves and pistons. This gave the new engine an extra 10 horsepower, along with a different appearance. The engine gained the nickname “Shovelhead” due to the look of the rocker heads having the appearance of an old coal shovel that was flipped upside down, giving the appearance of a shovel. While the engine did have problems earlier in its timeline, the new and improved motor gave HⒶrley-DⒶvidson a 26% sales increase The Shovelhead engine was ultimately fitted to all of HⒶrley-Davidson's big twin motorcycles throughout its production. The motors were first met with controversy due to the Shovelhead's weight and ground clearance. Because of this steering and weaving became a new issue that arose with motorcycles fitted with the engine. To bring more models into production, the FX Super Glide was released in 1971 with a "chopper" look that was ultimately an FLH with a Sportster front. This brought the motorcycle scene at the time to a broader audience and improved sales for the company. The FLH was also available with an Electra-glide package, which was used as a police engine for the motorcycles. It allowed the engines to turn over for a longer period while idling, along with having an electric start. Because of the added weight of the larger engine on motorcycles with the Electra-glide package, the bikes were faster and more powerful at the trade off of being much harder to maneuver. Due to the police package being a rarity, it is highly sought after by collectors.[2] Today, the engines are commonly used by classic motorcycle enthusiasts for restoration projects due to the engine's simple transmission, high torque, and smooth powerband.  .

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