Need help regarding 496 high water pressure?
 

I know this isn't the right place to post this, but I need some quick help so I can use the boat today.

My 496 mag HO is running 34 psi at the sea pump at idle hooked up to hose. The other one is running 3 psi. It's been mentioned that there might be a restriction after the pump, most likely the oil cooler, well I backflushed system and had excellent flow. The problem might still be partial blockage in the oil cooler, but I can't get to it on my 28 Daytona with it being on the port side. I also flushed out the heat exchanger. Any ideas on why psi is so high and causing drain valve to pop open and fill the bilge at higher speeds? I'm also getting plenty of flow out the tail pipes? Thanks!

Trying to get this nailed down so I can boat today. Any suggestions appreciated...

Sounds like a false reading, I never see pressure untill I get the boat going 20-30 MPH

No, there's something definitely wrong because the pump out valve keeps blowing out water at higher speeds.