I am getting conflicting information as to whether BEBs are an issue on 1HD-FT, and thus whether I should be considering replacing them on my 97 1HD-FT with 300,000 km on the clock. I just got the vehicle and do not know the history of the engine. However, it doesn't seem to make any unusual noises, and I pulled the valve cover off to replace the seal and the cam seems to be in great shape.