Jason,
I believe you need to locate the Tecumseh engine model to get the answer you need (not the snowblower model, since the Tecumseh engines are mounted on a variety of different makes of snowblowers). The engine model info is on a sticker or plate directly on the engine. Once you get that, you can search for any particular info you need. The following are some sites I found useful:
http://www.outdoordistributors.com/Tecumseh/Tecumsehpartslists.html
http://www.cpdonline.com/692509.pdf
http://www.tecumsehpower.com/CustomerService/BSI.pdf
Hope that helps a bit.