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Flathead Garage Flathead: 1909-1936 The Flathead was named because of the telltale flat vented tops that are recognizable at the top of each cylinder head. This is the famous motor that propelled Harley-DavidsonŽ to victory after victory in the motorcycle races of the twenties.

Knucklehead Garage Knucklehead: 1936-1947 On the eve of WW2, Harley-DavidsonŽ introduced an overhead- valve V-twinŽ with "knuckly" covers on the valves. The new motor, affectionately named the knucklehead, performed well both for HD and for America in the difficult years to come.

Panhead Garage Panhead: 1948-1965 New features are added to the 61 and 74 overhead valve engines, including aluminum heads and hydraulic valve lifters that supplied oil through rocker arms. The panhead hit the market in 1948, named for the pan-like cover where the knuckles used to be.

Shovelhead Garage Shovelhead: 1966-1985 By 1966 the Panhead underwent still more improvements, the most noticeable being the distinctive enclosed cylinder head in a sleek, slightly curved top. At a glance this looks unmistakably like a shovel with the pushrods resembling the handle of a shovel, and the head, the shovel itself.

Evolution Garage Evolution: 1984-1999 In 1984 on the heels of a bold employee buyout of AMF, the motor company went public and introduced its now famous redesign of the v-twin. This radical new design utilized styled square blocks to house the valves.

TwinCam Garage Twin Cam 88TM: 1999-present & Twin Cam 88BTM 2000-present With numerous American motorcycle manufacturers trying to surface and re-surface, Harley-Davidson introduces it's most revolutionary engine yet. The Twin Cam 88TM gets its name from its two cams versus one cam in all its ancestors. B= Balanced

Revolution Garage Revolution TM: 2001-present Liquid-cooled, 1130cc, 115 horsepower. The Revolution engine's basic configuration is a 60° V-Twin with dual overhead cams and four-valve heads. It's a high-revving design, with a 9000 rpm redline. Two velocity stacks housed in a massive air box allows it to breathe aggressively. Electronic fuel injection system, modified for high performance, and a new high-energy plug-top ignition coils.

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