[LaStang04]

Another interesting fact about roots type blowers for the younger crowd ( yes i'm an old geezer compared to alot ) . The first Roots type blowers were acually taken off diesel engines and adapted to fit on gasoline engines. Thus the ones you will find being called 4-71, 6-71, 8-71 and so on , those were taken off Detoit Diesel (GM--Gray Marine)engines and new drive housings made to run off a belt. Roots type blowers were around long before World War 2 on deisel engine applications.