Offy made two versions ... actually, four ... of their dual-quad manifold. One is about 1-1/2 inches taller than the other. I've only seen the taller version. The short version seems to have gone away years ago. I machined off about 1-1/4 inches from mine to make them look better (which they do) and perform better at lower RPM (which they also do). Mine fits under the hood with 2-1/2" tall air cleaners because of this, but the carbs need to have their linkage cut down a little where they interfere. If you get the tall version, and you want it cut down, it's an easy thing to have done.
