only changed the filter mount, the other(transdapt) kept leaking, but the moroso # 23750 uses a GM filter where the other used a ford style, on the other ran a purolator and a motorcraft, when put this one on used a A/C ??? no other changes...

M next move would be a mech gage to verify the OP.

talked to moroso, all they could say was weird...yeap me to..asked me to change to another filter, so going to try that...film @ 11 !!

Try Wix or Napa gold.

just put on napa gold...to hot to run 103 here right now...son will try later this weekend I think....did notice nice solid case for the napa gold(wix) so we see what diff it makes...

Oil pressure can be higher with a restrictive system. I actually lost a little pressure with the bigger lines, bigger cooler, better filter. Oil flow and good oil is more imprortant. However yours does sound low, myself and others have talked about only having 15-20psi at warm idle but 80+ at cruise and above. High pressure is somtimes a sign of restriction or to big of a pump. Let us know what you find out.
Did you use the correct model ? Mark IV and Gen V, VI are different. I use the Canton adaptor also, crank down the allen head screws, had a few leaks at first.
I just saw he replaced the filter housing, I was thinking about the block adaptor. Those are the same for whatever engine you are running.

in a closed system you don't gain or lose pressure with big lines. you don't gain or lose pressure with hi flow rate filters or housings. assuming that the sizes of the lines leading to filter housing are at least caprable of supplying the loss rate of the assy and that the filter has a flow capacity able to support the loss rate of the assy then once those two conditions are true, nothing bigger makes any difference at all and the pressure at all points in the system is constant.

when you introduce a critical restriction into the system then everything on the other side of that restriction loses pressure because the the loss rate is greater than the "fill rate" .

the bypass valve in the filter housing is made to save you when that occurs by getting around the restriction ( clogged/bad filter) the relief valve keeps the filter from exploding off the housing by keeping that assy below failure pressure.

so... what's going on here ?

1) a perfectly good assy makes perfectly normal pressures with all the hoses and fittings and filters as normal.

2) you unscrew that assy, take one end of the engine outlet line and attach it to your new assy inlet and take the existing engine inlet line and connect it to the housing outlet. you say you don't have these reversed ... so that has to be true.

3) you start it and have lower system pressure.

you know for absolute fact two things:

1) that the loss rate now exceeds the " fill" rate

2) that the single only place where a critical restriction could possibly have occured is the housing/filter assy you have installed.

if its me standing there, i scratch my head and say " wow... thats unbelieveable..let me put the old assy back on and see if this is really true" and if it IS true i know that the assy i just bought is does NOT have the flow capacity to service my loss rate and i also know that even if another similar sized one does, then is is probably VERY close to it's absolute limit in that regard. and i would want to know why exactly before i went much further.

I completely agree, he needs to step back and re-asess, maybe try a different filter in case that one is defective (highly unlikely though) or a filter that has a higher claimed flow rate like a k/n, Either way aside from a unlikely coincidental failure of something else a restriction was created by the new set-up, Smitty

did you see that thread where the guy had that little plastic piece floating around in the housing from the old filter ? unbelieveable stuff. i have seen guys screw a new filter on with the clear plastic wrap still on it and seal it up... it has to be something crazy simple... this just doesn't make any sense at all.

well can't put the old one back on..already shipped it back for the leak issue, before ever started and noticed the lower OP, should know this weekend what the napa filter change did, to me the issue has to be the mount or the filter...only thing changed....was also wondering what diff the relief valves were in the ford vs chevy filters ?? I did put the 30 psi in the gen VI block and using a canton block mount, #10 lines, total run less than 5', eddie marine large 3" cooler.