This really is puzzling; I consider myself knowing this engine as pretty fair...I am able to do most of all the work myself. With that said, I have no idea there would be the difference other than the 270/360 difference between the models. I do know that the cam covers seeping is a very consistent problem amongst the Bonnie owners and this has stayed the same throughout the Hinckley years. That is usually the one big complaint about the Bonnies...that these covers still seep. It is great that this does not affect the BA/SM but it surely makes me wonder why...
