Here is an online dealership that should be able to help you. I have included the parts list for your model.
Tecumseh has gone out of business and was recently purchased by Polaris snowmobile company. They are selling only the most common . fastest selling parts. Other parts may not be available.
Also, You should be able to go to just about any Tecumseh dealer to order parts if they are available.
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They have the parts listed.
I would not recommend spending a lot of money on these engines as you will have great difficulty getting parts in the future.
Here is the information on the cylinder head.
If you want to order these parts. Contact www.oldmowerparts.com at their E-mail address: email@example.com
Give them the model number information and the part numbers that you want to order and they will get them for you if they are available.
Remember, they will not have them listed on their site as they will be a special order. So be sure to contact them by e-mail.