As I stated in my title I was trying to get some clarification on the engine in the 1974 ss/16 tractor that I am working to restore. I recently became the owner of two ss/16's a 76 & 74. The 76 is coming along well but the 74 is still in the works. I pulled the plugs and found that they are short compared to the 76. I don't have any back story on these so it's on me to figure out.
From what I have found online I'm thinking that it is a 18hp engine, if so what plug would you guys run in it? If it is a 16hp engine why would it have a different plug? Thanks for the help as always.