Technical 277cid v8 1956 Plymouth high oil pressure problems

Hi all,got a weird one here. Been running a 1956 Plymouth Belvedere with no issues at all.changed the oil and filter,fine on tickover and low revs,as soon as you hit high revs it blows the oil filter out!! I’ve re***embled it 7 times now,even pressed out the housing a little for a tighter seal,still blows apart.its like the pressure relief valve is stuck or spring broke?? Any ideas on location of it at all and has anyone ever else had this problem?? Thanks in advance for any help at all,pulling what hair I have left out with this this one!! Was fine before,could be a coincidence or was it just so well sealed it covered the problem??

 

***uming this is a spin on filter you're referring to ?

 

It’s an oil filter housing that takes the paper cartridge,keeps blowing the seal to block out,new seal,nice and tight

 

Put a gauge on it to see what the oil pressure actually is. Perhaps the drain back line for the filter is plugged.

 

which engine 6 cyl 270 or 277- 303 all different but you have a relief valve issue

 

Make sure there isn't an old canister seal stuck up in the oil filter housing.

 

It is s 277 v8,oil filter housing all clear,I’m going to do a little homework on where the pressure relief is and get back on it the weekend,I’ll keep you updated

 

Where it was fine until the last oil change, there's a possibility that sludge could have turned loose & clogged something.

 

You’ve not put the spring and cup on the top of the filter have you?

 

All back together 100% as it should be,

 

As said, check actual pressure, those square seals can blow out pretty easily if not seated just right.
Looks like the pressure relief is built into the pump, so if it IS high pressure, the pan's going to come off.
http://www.forwardlook.net/forums/forums/thread-view.asp?tid=71760&start=1

 

Finally got a weekend off and bit the bullet.determined to get to the bottom of it,exhaust down pipes off,starter off,gearbox plate off,steering idler off,undone engine mount u bolts and jacked engine up.removed sump to get to pressure relief valve in pump,solid!!
Looks like engine has been rebuilt recently,new gaskets and I checked big end bearings,took out oil pump, stripped,cleaned and polished relief plunger.re***embled,flick of a key,fired into life,problem solved! Guess it had been sticking for a while or I was just plain unlucky? Gave it a road test,drove like a dream again,time for some paint now.

 

Good job!