I have a Mercury Grand Marquis, 302 cubic inch V8 (1989) I would like to replace the PCV valve. I am guessing it comes out one of the rocker covers, which one ? I looked on AutoZone website, rather vague, pointing to the back off the engine. Do I have to remove something else to see it ? I have just swopped one on a Dodge Durango, pig of a job but at least I could see it !

If memory serves,. it should be a smallish "elbow" looking thin that is stuck into the valve cover... a hose should be coming from it.