I can tell you right now you are baking the oil and that is why your oil pressure is low you need some way to check the oil temp right before the oil go's back in to the motor right at the engine block filter pad is the best place

running 96 Gen VI..they are not merc motors, originally Kodiak marine crate motors that I had made to 540's then stroked to 565's

You need to check the bypass valve or valves I'm pretty sure you have a 11 lbs spring presure valve install and with that the bypass valve is open the whole time and the oil is not being filtered and cooled you need the 30 lbs bypass valve spring presure installed in the filter pad check the center where the oil fiter would spin on to the block and make sure there is not one there if there is remove the one in the middle it will be in the block where the filter adaptor screws to the block these valve work on differential pressure and with the 11lbs will think the filter is pluged and will then open and bypass or filter and cooler then would make your oil very hot and break down and then you see low oil pressure if you run it like that to long you will gernade the engine
http://paceperformance.com/index.asp...&ProdID=113140

http://paceperformance.com/index.asp...D&ProdID=22977

Put merc oil filters on them and they will run cooler oil temps.

If you really had 0 to 10 lbs. of oil pressure, the low oil pressure warning buzzer would activate. Is that system working?

nope long gone.. anyone have instructions to remove and plug bypass ?

This thread has it covered with a pic. Great thread if you haven't read it all yet.

http://www.offshoreonly.com/forums/s...+bypass&page=2

Photo courtesy of PatriYacht

A screw driver or long 3/8 bolt will tread right in to it did you look at the bypass valves at the pace performance you need the 30 psi valve call any gm dealer they might have one is stock or next day if you are going to plug it you will need a 3/8 npt pipe plug and a 3/8 ntp tap and be sure you remove all the metal from tapping when done

I'm pretty sure I can get to it..have to drain the oil pull off the block adapter . I'll cut the filter open.. THIS BLOCK was REPLACED when I rebuilt..said its prob a 11lb bypass valve, engine shop said he'd stand by his work . but he's cross state..so plan is to remove and plug the by pass, oil /filter change. reassemble. fire and check. Install temp gauges..time is running out have to be winterized or pull by OCT15. ..maybe I can get SKramer and Fullforce to help ?????

I helped a friend build a couple Cigarette smoking 502's this past winter and they had low oil pressure and high oil temp.
The problem was he had standard oil filters.
He replaced them with HP4's and changed to mobile one.
He picked up about 40 psi and lost 100 degrees on oil temp.