This is a SOHC VTEC, not twin-cam, correct?

If it's a D16Z6, the marks are not supposed to be at 3:00/9:00 that's for non-vtec 1.5 and 1.6 engines.

The small mark on the cam gear at about 7:00 and the pointer on the back cover are lined up on Z6 engines. Login to read more.