Digger,I think I know what you are asking,the large hole in the air cleaner is connected to the blower housing with a large rubber gromett,kinda like "RAM AIR",it was already on this engine that came off of a generator,I cant use a pto unless I switch cranks because off the tapered crank end,but I can use this tractor for other things I guess"lol".Thanks for the nice comments on the blade but I like the used look too. kenny m.