Alright I did some more measuring and I resolved some questions. A flat opposed Briggs has approx 3" from the engine base to the bottom of the cylinder. A cub 108 frame measures apprx 5" inches in depth to the base. So with that said apprx 2" of the frame would have to be notched the length of the cylinder head so MattG is right on that a major section of frame would be removed and that would cause weakness. Of course none of this applies to the Vanguard V twins. Now for my part I dont think it is feasible or economical to attempt this engine swap so Ill go to plan B and sell or trade some of my tractors and see how things turn out to see which way I go from here.
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Don Smith
https://www.facebook.com/SouthernKentuckyCubCadetClub
IH 982D aka "The Big Red Smoker" BRS w/3pt hitch
CC 1572 aka "The Big Yellow Smoker" BYS w/3pt hitch-PTO
Brinly Cat 0 3pt plow-Brinly sleeve hitch plow
Custom Hydraulic lift disc-Haban Blade-Brinly Cultivators
Cub Cadet lawn trailer and lawn sweeper
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