The weight I listed was done with a digital scale. One correction though, I did not have the ignition on the scale only the mufflers. This would add 4 oz, sorry. FPE did lighten up this engine from the prototype. As for power, I have anther in a plane I flew last summer. Its power is nothing short of fantastic. It turns a 28-10 Mejzlik 6400 RPM. The best part is how smooth it runs along with a very nice power curve. Form idle to full throttle the response is consistent.