In the early days of forced induction, almost all the blowers adapted by rodders were ingeniously based on compressors not designed for pumping more power out of the Ford Flathead. In fact, not even the famous “Jimmy” Roots-type blowers were designed to increase output of the diesel engines on which they were originally fitted.
The GMC 71-series blowers were developed as air compressors to pull in fresh air and push out exhaust gases on Detroit Diesel two-stroke diesel engines. A 6-71 blower was a compressor on a six-cylinder engine, while
