Farmall H Gas Head w/ Kero Valves

Okay everyone, dumb Idea here but I figured I'd ask. Kerosene heads are around $300 or above on ebay and $100 shipping.. Is it possible to put the longer kerosene valves in my gas head and call it a kerosene head?

No. The low compression head is low compression because the combustion chamber is bigger. The valves for the gasoline head are longer. valves from a kero head would never allow the springs and keepers to be installed. Your real solution (which keeps your mind at peace is to find a Distillate, or Kerosene Head. there is no compromise, and they are both common, and cheaper then a gasoline head because few owners want the distinction of purity on a tractor as common as an H when the difference can't be detected from common looking at it. Jim

No, the valves won't interchange from one style head to the other.

Just a little warning when it comes to buying used heads. Used heads have been known to be cracked. When buying a used head, it might be of your best interest to buy one from a place that checks them out for cracks. And doesn't sell them un-checked. Rather than from a place that doesn't check them out at all. Just tells ya, yes I got one here I took off of a parts tractor.

Shipping fee at a $100 one way, I don't think I would want to be checking them out for cracks on my end. Would want some sort of a guarantee to atleast be a rebuildable head as well.

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.
Example Kerosene head

YT post on H head chamber size

We have all told him that several ways but this guy is determined.. Just get a kero head .. What he is going to have is a mess.. but to each his own.