* For the base 911 (Carrera) and 911 Carrera S: The engine used SOHC (Single Overhead Camshaft) with four valves per cylinder. This design was also used for the 911 Targa and 911 Cabriolet models.
* For the 911 GT3 and 911 Turbo models: These high-performance versions used DOHC (Double Overhead Camshaft) with four valves per cylinder.
Both engines used hydraulic lash adjusters for valve clearance.
Important Note: There are slight variations within each cam type depending on the specific engine code and model year. To get the most accurate information, you'd need the specific engine code (e.g., M97.21) or the VIN of your 2006 Porsche 911.
