Figuring displacement?

My mistake. I thought you said BJR was correct ONLY with 8 cyl.'s. He (BJR) IS correct if you use the correct constant (# cyl's). I have used many formula's over the past 35 years and the one BJR uses is the one I use. It is fast, easy AND accurate. Shorter is what I should say. Only four entries and you have results. The busy man's formula, if you will. Terry.