What types of brushes are recommended for stock and what type are recommend for modified?
A brush made from a silver compound is recommended for stock. Silver Brushes also leave sludge behind that can only be removed by lathing the comm. Silver should be used for competitive racing where the last percentage of power is needed to win. A brush made from a copper compound is recommended for modified. Copper brushes don’t leave behind sludge and works best with high RPM motors.
