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| | | | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | Are you running the pressure gauge before or after the filter? Are you running the original filter? If the filter clogs up there should be an internal bypass. If you are using a spin-on make sure you get one that either has a relief or uses a filter that has one built in.
If you just plugged the oil lines and they are the 1/2" NPT sized ones then the oil is not getting to the bearings, causing the high pressure. Have you checked to make sure the head is getting oil?
The only place high oil pressure causes leaks would be the head gasket or the filter and lines.
My 261 runs about 45 lbs cold and about 28 at warm idle on Delo400 15W-40. It runs a bit higher on 50 weight oil.
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