Not if you like blown intake or head gaskets. Around 20 to 25 at wot

http://www.mercruiserparts.com/

I broke the plastic top off my sea strainer running 35-45lbs. If not for installed shutoffs for flushing it would have sunk during the Chelan Poker Run. I raised the pick up so it is level with the bottem and it lowered to 20-25lbs. also I am installing a pressure relive valve onto strainer.
Rick

NOBODY LIKES BLOWN INTAKE/ HEAD GASKETS!
I would like to take this time to thank evryone who chimed in on my problem. once again THANKS!

cant seem to find part on BAM marine. What is it called?

I'm glad I'm not alone here. I'm going to install the relieve valves this winter. The boat is away from home right now and a bit hard to work on. Just have to keep it off WOT and below 25 psi until then.

Thanks.

I remembered that I saved a Pic someone posted last year...Don't be shocked at the cost, Merc is very proud of them.

Been there! Spent 1/2 the summer at cruise speed as my WOT while I was screwing around with different housings, hose dumps and what nots with zero luck. Got tired of it and bought the relief valves and couldn't be happier. On the positive side, I saved alot of gas! I did buy new springs to lower the pressure even more. I think the relief valve still comes in at around 30psi as a max, but I wanted 20psi as a max. New springs for under $10 and all is perfect now.

Back4More also did the spring change over for best results.

US thanks for the info. I could only get up to 40 mph at that speed was 25 psi water pressure. I have to figure out where to dump the water dont like the idea of water flowing out the side of my boat.

depends on which engine and mangement system you have. some require high pressures like yours. otheres do not. was this the original readings or was something changed ergo drive, engine, cooling system mod's , etc,,,?