Some back ground information, according to the manufacture date on my 261 that I’m installing in my 1950 1 Ton it’s April 19 1955 and the head is a 848 head manufactured on May 5 1958 (see photos)
I had them hone the cylinders and install new block and cam bearings and the head was rebuilt with new guides, seal and resurfaced, they also did hot tank cleaning, magnafuxing (no cracks anywhere) decked the block top and bottom and shaved the head. I’m very happy with the rebuild so far! I’ve checked multiple sites, some that have great information and some not so much! I’m sure most on here know which is which!!!!!! Can someone confirm for me that this is or is not a full pressure oil 261 or a bypass one? In one of the photos there is a screw on the exhaust/intake side beside the frost plug above the oil filter lines that I’m very curious if this has anything to do with my issue. After installing the rocker assembly then using a drill to spin the oil pump I couldn’t get any oil to drip out of the rockers,( yes I did confirm the holes on the shaft are facing down). I also discovered that the engine needs to also be turning over so that the oil bypasses the solid lifters ( and yes they are the ones with the annulus indent). I still couldn’t get oil up to the rockers so I pinched off around half way give or take the clear line (see the photo I used it just to have a visual that oil was flowing where the filter was going to be added). I thinking that this oil filter line will need a restriction fitting installed which would mean it’s a bypass filtered oil right? I have to check the old lines but i don’t think there was any restriction in them.
Any help with identifying or clarifying or thoughts on this would be appreciated.
