671 blowers are completely rebuilt using high-speed bearings and seals. Rotors are machined for proper clearance. They are set up and timed correctly. Gears are drilled for six bolt pattern, and a new grade 8 hardware is used throughout.
Blowers are available in four configurations:
GM 000 ............... unpolished, stock endframe.
GM 000-1 ........... unpolished, finned endframe.
GM 001 .............. polished, stock endframe.
GM 001-1 .......... polished, finned endframe.