DOHC... can a cam be 180 degrees out?

What is your question?

Replaced water pump. Started to install the timing belt when I noticed the rear cam (next to the fire wall) was off by 1 tooth. Instead of using a breaker bar I grabbed a ratchet. The gear spun (slid down the cam), so I turned it clockwise back to the mark. All 3 marks are aligned TDC on compression stroke and rotor pointing at #1 spark plug but car won't start.