2 quick e320 1995 questions

[sasjzl]

Hi all,

Two quick, I think, 1995 e320 questions.

1 - Is the low pressure ac port the one that is very easily accessible and near the manifold. The smaller one?

2 - Any famous last words from anyone who, like me, has been driven crazy enough by a top end tick that they opened up the valve cover and replaced the offending lifter? I have done a head gasket so I have been in there before but did not pay much attention to the lifters. Can I find the culprit by pressing down on each one and seeing/feeling which one is different? Or do I have to run the engine and watch the valves?
I saw a video on YouTube where the guy just pressed on the lifters without the car running and it was obvious which lifter needed to be replaced.

Thanks very much,
Jim Lee