How much is too much? - Oil pressure

What rated pressure is the relief spring, or what color is it?

Kind of hard to tell. It looked a little like the pink one that I had in the kit for my other pump that was their high pressure one but there was only a hint of color.
 
this might help:

214da3a8b48185c.jpg

the pink spring is for 70lbs pressure, second highest pressure they offer (green is 78lbs) ....
 
Assuming it's a Melling, which most are, then that should be a 70psi spring.
You could still be pumping 90psi at the pump and going over relief to keep at the 70 +/-. No way to tell.
If I was forced to choose, I would rather run 100 psi not going over relief than 70psi and going over relief.

Hopefully the thinner oil will bring you under.
Get some miles on it, it should drop a bit with that.
On a high note, seems like you have a tight engine.:bounce:
 
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