Need advice please Keno

Just put a used Gen 4 454 in my fish nautique the engine had only 90 hours on it from brand new ,guy didn't use it much
I'm running raw water

When I start my boat 70-75 lbs of oil pressure even after it warms up it only drops down to 55 when I'm on step it goes back up to around 75 even once the oil is hot... Hooked up a manual gauge to confirm as well.

Boat is running perfectly fine

Is this anything to worry about?

Straight 40

Drops to 55 at idle when hot but on step it gets 70-75
If this isn't too high I won't stress about it I definitely don't have any leaks or nothing like that

Man, thanks for the details , feeling much better already .

Gen 4

U guys are awesome

Yes sorry Mark 4

I've always taken your recommendations. What's your opinion on straight 30w

Amazing how modern engines have progressed- 10 years ago BMW F1 engines were turning 19k, oil pressures ranging around 10 pounds. The wife’s newish cars oil pressure I have never seen go over 20 lbs hot or cold. It uses 0-40 oil and the pumps output is controlled by the ECM. I have also heard in Ford Windsor applications that a standard oil pump is preferred.

Thank u for your input

Okay guys, couldn't wait to get home and conduct more experiments. I drained the oil and put 10w30 rotella with a manual gauge

cranked it up and it was 75 lb I let it idle for about 20 minutes and it came down to 70
If I idle it up to about 1700 for about 5 seconds it will jump up to about 85
Then back down to 70 at idle

a little more info, my oil sending unit is up right by the oil filter with the relocation housing. There is a 90° elbow coming out and the oil sending unit screws into that 90° elbow....

A friend of mine (lol)
told me to move the oil sending unit down by the old oil filter housing. They're now is my oil temperature sender..

If it matters my oil when running it this weekend really didn't get over 150 degrees
it was a cold day in louisiana, raw water pump , and 65° water as well
It's possible that my temperature sender is not working correctly

And this is your nightly update. Thank you very much

Lol

Does not burn oil and runs so very good . Going to take her on a longer test drive this weekend with warmer weather in the 80's

Can a "stuck" relief valve free up?
Also I assume moving the oil sending unit away from the 90 at the relocation kit filter down to the old oil filter housing would not accomplish anything.

The by pass in your GM oil pump is a piston floating in a cylinder, oil pressure on one side and a spring on the other side in the cylinder.  When the pressure is too high the piston will compress the spring and as it moves it opens a by pass channel which allows the excess oil pressure to dump so it keeps a steady oil pressure in the engine.  I have been told that a good oil pump will be opening the bypass at any RPM over 500 in a tight engine because they produce more oil pressure than you need.  To answer your question about can it fix itself, remote chance but not likely.  If some particle is stuck in that cylinder and the piston is wedged against it odds are it will not fix itself.   It is possible the previous owner liked high oil pressure and installed a high pressure spring in that pump.  I would not sweat it.  If someone comments about your very high oil pressure just tell them you like a tight engine, they last a long time!

Is it okay if I relocate my oil pressure sending unit away from the oil filter itself that comes with the bypass kit and move it down to the bottom of the engine where the stock oil filter was.

One of the reasons I'm asking it is a tight fit there where it's at. I'm sure if this will affect the readings or not

10 4

You guys are too Notch !!!