In 1966, the base-model Porsche 911 saw several enhancements as the factory refined its production processes. Key updates included the transition from Solex to Weber carburetors powering the same air-cooled, rear-mounted, 2.0 L flat-six engine, which improved performance and reliability, and the "Type 901" five-speed transmission became more common, moving toward standardization over the four-speed offered as standard before. Th...Market description provided by CLASSIC.COM