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Discussion Starter · #1 ·
Does anyone else out there have one of those 680 prototype engines with the 1 pto bearing and the small jug bolt pattern??? I need some gaskets etc to do a major overhaul. I am told that the prototype engines made more H.P. with pipes than the production engine ever thought about?? That came from a pipe manufacturer though. Does anyone have any sources to some accurate and true info on these engines and why did they make that change?? Thanks in advance
 
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