Cat 20 head gasket question

That is interesting, I have a 20 instruction book form SL991 from 1929, and it does state that there is only one water hole for each cylinder in the head gasket, and not to add more as the extra holes in the head and cylinder are just for coring the castings, and adding more holes may cause heating.
And from the 20 parts catalog of the same vintage.

Mike, I can't see a good view of the jugs but; Those look like they're off a 28. What bore are those? Your very lucky to have a good complete manifold!

And a few more pics, I have 2 heads, but the spare is suspected to have been cracked across the middle when it was being lifted off the block by a previous owner.  I have that one soaking in a citric acid bath at the moment, removing all the rust, and will crack test it, but notice how both heads have 4 "water" ports per cylinder.

I can see why owners or Mechanics over the years here in Australia would have cut a couple more holes in new head gaskets before fitting them, particularly as the cylinders have 3 holes in them, the engines would have been getting hot working hard in our summer heat.

you've out done me!
doug

Ha ha, why is that Doug, for the shocking condition of this old Cat, you can see why I call my old girls Boat Anchors!

Mike, what is your location? I have a Big 20 parts tractor that I want to get rid of. It has lots of parts that are much better than yours. Located Northern Calif.

Grant Jordan