V6 cams

I'm working on my Omega 2.5v6 and trying to help someone identify inlet
and exhaust cams I had a look at mine while they were out.

According to the letters stamped on the cams I have 3 inlet cams and 1
exhaust cam. I haven't had a noticable problem with the engine running
and I've had the car for 9 years. Would it run with an inlet cam in the
exhaust position? I'm wondering if I've got the wrong cam or the right
cam with the wrong letter stamped on it.

Incidentally when I stripped it down I found three faulty exhaust
lifters together in the front three positions where I've got a
suspected inlet cam instead of an exhaust one.