I missed this discussion but will add, the shape of the head gasket has to match the combustion chamber in the head and that is why hole is not round.
IH did this forever on older tractors like H up to 450. Was a caryover because the 560 engine was adapted from the truck engine that no sleeves.
This makes the sleeve flange protrusion over block critical so fire ring can seal where it crosses off the flange. A little sealer like Indian Head in those spots help a lot.
As for the lower spot between cylinders, common and may or may not cause a problem. Again a little sealer does wonders in right places, not all over gasket.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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