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why not?
because if the relief valve was already doing it's job if pressure was already at the max, therefore ensuring there would be no pressure increase, because it was being relieved, if it was already doing its job, was the point i was making.
too many coffees today .....
no increase or decrease at 30 mph in 4th with plug in but a 3 to 5 psi increase in idle psi {45 to 50ish}
un altered atm but ill tamper with it over the next few days and try and get it up to 60ish psi at 30mph {its sitting on 58ish psi atm same as before plug }
main difference is the high level of oil in inlet rocker droped just below rocker gasket and valve guides rather than over and being drawn into valves and seeping out the rocker gasket on the inlet side...
The compromise here is the balance between oil usage and keeping the engines head cool under extreme hot working conditions.
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sounds like the relief valve is working nicely
2psi would be within the +/- of the gauge in all probability