Although JANich has it pretty well covered I figure that a visualization would not hurt. It took me a while but I found a low compression 6186 head, the picture is not the best but I think it will work. In the 1st link is pictures of the H kerosene head which is out of stock. Look at the photo of the bottom side looking at the combustion chambers, unfortunately the lighting in the photo is low. Look at what would be the top of the spark plug hole when the head is on the tractor, we will call that point A. Look where the combustion chamber side above that hole turns and meets with what I will call the ceiling of the chamber that the valve heads seat in, we will call that point B. Look at the distance between A and B in that photo. Now compare that to the A to B distance of your head, I think you will see a noticeable difference. The depth of that chamber is what changes the length of the valves because the rocker arms and shaft set at the same distance from the surface of the block no matter what fuel the tractor was designed to burn. The depth of the chamber in this case allows the combustion to have a larger air volume thus lowering the compression ratio. The second link is an old YT post that discusses the different chamber volumes of the various head casting numbers. Hope this helps, I will still keep telling you that your choice is unwise, but the horse is dead.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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