AGCO still offered them for the 33 (and I'm almost certain the 44's are the same) a few years back, but very pricey.. I think they were something like $30 when I bought mine.. But was a very nice fit.. Came with the gasket and all (which when you buy a thermostat for a car, etc. you usually have to buy it all separate).
Kessels may be cheaper, and they are very good people to deal with.. all of my rubber parts for my 33 came from them, as well as a few other misc. items.
You can also make one from a small block Chevy work by cutting a piece of pipe that will hold it tight in the top of the neck, but will sit on the head surface when the neck is installed, and cut a slot in the pipe for the bypass.. I saw a friend do it for one of his restos, but i did not take notes on exactly how he did it.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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