Inspecting the oil filter first is the best next step. Making sure the guage is not the issue as well.
If you care for more work I would suggest the following course of action (this is what I would do others may differ so please use this as just a suggestion). In the past I had a high oil pressure issue that was caused by blocked oil ways so I have chased this issue once before. I followed this and came to the conclusion to remove the engine and found that after heating the engine up after a really bad rebuild the oil passage in the crank all clogged and I ripped through all the bearings… Worst case, most likely not your issue as your engine was running fine prior to changing out the oil filter assy.
One course of action is to always revert back to the old oil filter assy.
Possible course of action….
1) Get the oil to the correct level, +/- a 1/2 quart should not make that big of a difference.
1) Start near where you did the work. Remove the spring and plunger on the oil relief valve. Reseal the screw cap and run the engine with the spring and valve out. If you have normal oil pressure the issue is the valve, replace with new. If not replace the spring and plunger and cap. This is simple device that plays a critical role so eliminate it early.
2) Do the next easy thing. Remove the rocker cover and run the engine for a moment or two to observe the oil flow. If you are getting a good steady drip like flow from the top of the rockers good, if nothing you have a oil passage clog. This can be messy and others might have better suggestions on how to check oil flow at the top.
One way I have done this was to start when the car has had time to drain like the AM. Remove the cover, observe the amount of oil, Reinstall the cover, run the engine for 5 minutes. quickly remove the cover and observe the oil. You can tell if the oil has been flowing for the most part.
3) Back to where the problem started but a little more work. Remove the oil pan. It's a pain but I would ensure that the hole near the oil pump is clear for oil to pass. If in changing the mounting bracket you dislodged gasket material or sealer it could have got into the relief side for the oil relief valve and created a clog, this would in effect disable your relief valve. This will also give you a good look at the bottom of the pan and you will see what condition the inside of the engine really is in.
Reseal and install the oil pan, making sure not to use too much sealant and keeping the area where the oil pump bleeds off clear. I like the brush on gasket sealer so you can control what goes on the gasket.
4) If after all of the above the oil pressure is still high, I would have a local shop take a look at it. I don’t think you created any damage with a high pressure but if there is a blockage you could be starving a journal or bearing and that will create an issue quickly.
Next course of action I took (not recommending unless you are comfortable with this level of engine work) was to take the caps off the rods and inspect the bearings. This is where I found signs of my issue……..
Hope these help.
Michael.
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