D12 engine rebuild

So I'm rebuilding this engine for my cousin. He bought the tractor with a stuck engine. When I pulled it apart I noticed everything looked like it was not that old. If it wasn't for the stuck pistons id clean everything up and reassemble. So not knowing the history of this tractor I got a new overhaul kit. In the process of cleaning the block I noticed I couldn't blow through the tee fitting on the right side center of the block. After doing some looking I'm sure the center can bearing is wrong. So here's my question, does the center camshaft bearing suppose to have two holes? I only ask because looking at photos of cam bearings on the web they only show one hole. I've even looked on this site and they only show one hole. They do state the center bearing is different but they say it's a different size. Any advise is appreciated!
 
The camshaft bearings would only need one hole and would need to be lined up with the hole in the block going to the main bearing. The camshaft in this engine is pressurized and the oil must pass out the holes in the camshaft bearing surface thru the camshaft bearing hole to the main bearings and then thru the drilled crankshaft holes to the rod bearings. With a camshaft bearing hole not lined with the hole going to the main you would lose oil going to the main and some rods.
The tee in the side of the block is where the rockers get oiled. You will need to find where it is blocked.
 

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