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I did take some measurements of the old flattened oring.
Why disturb the valve/O-ring? Leave it alone and it should be fine. Unless the O-ring is broken I wouldn't worry about it as very little pressure to cause leaking with 4" of oil on this earth gravity (I would worry if we live in the Black Hole though).
 

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Long story short, I have 2 heads and needed to transfer the valve to the other head. aka it needed to be disturbed.
No reasons to remove the check valve when transfer the valves -- not related.
The o ring was very very hard and I could not in good faith just plop that into the other head without replacing lol.
with the head bolted on the block, the O-ring is clamped shut and no where to shift.
I can always test and pour oil into that galley and see if any passes thru before installing the head on the block
Do this. I would also test the head chambers for any leaks via the closed valves -- pour gasoline on the head chambers with no cams, and if no leaking in 5 minutes then they are passed.
 
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