A Street Sleeper is reborn! THE END

[procta]

The only way valve stem oil seals will cause oil pressure to change is if a piece breaks off and clogs up a main oil galley, you may have worse issues that that going on.

I think with it starting to loose oil pressure for me is more likely that most of the oil in the engine has gone out the exhaust. At the moment its tapping like a ford fiesta when you start it up, i bet if i was to drop the oil out of it now, there will be less then 2 litres in it.