Alright I have a situational question. this is not a datsun question but would apply the same way I suppose. heres the situation. this is an 87 Toyota Supra with 7M N/A engine.
Cooling pressure remains after 9 hours and sometimes remains when the engine is cooled totally.
now before we go down the Blown Head Gasket road, I will say that the system has been tested for contaminates, and there is nothing, zilch, and nada. totally clean water.with no hydrocarbons or COs.
also leak down tested and No sign of a BHG.
Running just water wetter. and a 1.3 bar cap, radiator and lines all new or in excellent condition, new thermostat new water pump, pressurized reservoir with 1.3 bar cap. No actual problems with the car, nothing is wrong with it whatsoever, and it gets beaten hard, and sits in traffic for 2 hours and never overheats.
Obviously this isnt "normal" per say. but is it a cause for concern? especially if everything is known in excellent condition and theres no issues with the car?