How do you set camshaft timing on 1978 Porsche 911 27?

To set the camshaft timing on a 1978 Porsche 911 2.7, first ensure the engine is at top dead center (TDC) on the compression stroke of the first cylinder. Use the timing marks on the camshaft gears to align them correctly; the mark on the camshaft should align with a reference point on the engine case. Next, check the tension of the chain and adjust if necessary to ensure proper alignment. After adjustments, rotate the engine through two full revolutions to confirm that the timing remains correct before reassembling any components.