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There are three small plugs, two at the back and one at the front, that plug the oil galleries. One is the pickup gallery to the filter from the pump. The other is the main supply gallery.
I received several questions on why I was pulling these between this post and my post on Turbobricks. This block was hot tanked and my machine shop does a "fairly" good job. They usually pull the plugs and then replace them with new ones, sealed in place, and this time they did not. They used the excuse that they no longer have a source for the metric plugs. I wound up drilling out the old ones, and I'm glad I did. I learned long ago that the hot tank process cannot take the place of a good scrubbing. I never assemble a block before it has been thoroughly scrubbed with soap and water. I have a set of wire "rifle" brushes that I use to clean out all the threaded holes and the oil and water galleries. In this case running the brushes through the block netted me a bucket full of filthy water and lots of sediment and sludge. The block drain at the back had to be cleared with a screwdriver and a wire brush on a drill. Whatever was in there wasn't even phased by the hot tank!
In the end I used regular NPT pipe plugs for everything. 1/4 NPT for the small, 3/8 for the large water plug near the top of the block on the side. I was unable to find anyone within 75 miles stocking metric plugs.
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