Hi John. Yes, the pressure relief valves in each head were the first things that were changed as they're easy to get at.
Looking at the old ones, there seemed to be nothing wrong with them.
The odd thing is, if you start the engine cold and take the filler cap off, you can see the flow of oil albeit under the splash plate coming out of the valve.
Therefore on the one hand, with the valve leaking off one would assume that there is enough pressure in the oil gallery and the lifters should be pressurised.
But on the other, the lifters are 'ticking' which suggests insufficient pressure!
By bringing the revs up to 1200rpm the flow increases significantly and the lifters are quiet.
Alan
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