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Hi jehan,
The angle of brush centerline to commutator radius is irrelevant to direction of rotation. It's primary purpose is to reduce chirping or bouncing. That 22.5° angle is used for decades on all Prestolite motors which rotate both ways.
Of more concern is the factory brush advance of 4.5° favoring its 'as shipped' rotation. That can be changed by redrilling the holes in the aluminum comm end head casting. The relief pockets for the 4 screw heads are wide enough to accommodate the additional hole. After doing that, the motor will work perfectly fine.
major
The angle of brush centerline to commutator radius is irrelevant to direction of rotation. It's primary purpose is to reduce chirping or bouncing. That 22.5° angle is used for decades on all Prestolite motors which rotate both ways.
Of more concern is the factory brush advance of 4.5° favoring its 'as shipped' rotation. That can be changed by redrilling the holes in the aluminum comm end head casting. The relief pockets for the 4 screw heads are wide enough to accommodate the additional hole. After doing that, the motor will work perfectly fine.
major