In 1985 the Countach's engine was improved again, bored and stroked to 5.2 liters and given four valves per cylinder (quattrovalvole in Italian). The carburetors were moved from the sides to the top of the engine for better breathing - unfortunately this created a hump on the engine deck, reducing the already poor rear visibility to almost nothing. Some body panels were also replaced by Kevlar. In later versions of the engine, the carburetors were replaced with fuel-injection.
For the first time, a US specification model was produced by the factory, with styling changes to allow bumpers to meet US federal standards (large, bulky bumpers were used that, to many people, ruined the smooth lines of the car). Although this change was the most notable on the exterior, the most prominent change under the hood was the use of Bosch K-Jetronic fuel injection, rather than the six Weber carburetors used in the Euro-spec model.
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