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Message: <blockquote data-quote="Mr. OAM" data-source="post: 382686" data-attributes="member: 9816">Wow. Just wow.It's called "Roots" because that was the name of the brothers that invented it and that is why the word Roots is always capitalized. It was designed as an industrial ventilation device.When manufacturers say "Roots type" they mean it is not an original Roots Brothers blower but rather a more modern design that utilizes two rotors for the air displacement action, as opposed to twin screws, the same way the Roots brothers designed theirs. This makes it a "Style" of supercharger.GMC used the Roots blower on their diesel engines in trucks. It was not used on cars. Other incarnations of the Roots style of blower was used on cars going back as early as 1907, but that was in a race car displacing over 1,100 cubic inches.In the case of the designation of the blowers you are real close. In the case of a 6-71 blower it would function on a GMC diesel engine with 6 cylinders displacing 71 cubic inches each, or a 426 cubic inch engine. However, these blower are rather inefficient and produce a LOT of heat, but modern automotive designs of it are better, yet compared to a twin screw type supercharger they still give up some performance. That is the reason for the popularity of superchargers such as Whipple and KB. The Lyscholm design is much more efficient. Lyscholm is responsible for the modern design of the twin screw style of supercharger. He patented it in Sweden in 1935.Roots....<img src="http://www.fordflathead.com/images/blowersizes/471-671.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />Twin Screw<img src="http://www.whipplesuperchargers.com/images/howitworks/rotors.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />Steve</blockquote>