I'm looking for the experts to explain what the valve stem seals are for, and why some engines have them and others don't. Actually I am curious to know if the 3.5 litre engines of the late 70's and early 80's should have these on the intake and exhaust valves.
I seem to recall when I owned my 98 Land Rover Discovery, that there was some issue of "sticking" valves, and either you removed or added valve seals as part of the solution... ???