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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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