dont mean to burst your bubble, but that old "836 kit" is argueably the biggest lie ever told, and certainly told the most often. Look at your engine mount bolts, i bet at least one of them still has witness paint on it. There is no way to prove nor disprove this story, without pulling the head. Honda used witness paint on the engine mount bolts. look close, you would be surprised to see how many of the bikes all seem to have the 836 story, and still have the witness paint, meaning its never been out of the frame. Many people have never ridden a well tuned cb750. cut the inner back wall out of your air box, install a 110 main jet, set your timing at full advance, and even a stock CB750 will run like a scalded dog. Unless the new owner has ridden a well tuned multi cylinder, they will beleive the story. If you still think you have an 836 kit, go find a pal with a KZ1000, and run them off. If all you see is tail light, you DONT have one. A well tuned 836, while it will not beat a KZ1000, its a race.