"HC6" = Heavy Duty C60 series. Heavy Duty C60, was a 70 series from '60-'63. In 1964, '65, & '66 the 70 series designation was replaced by the Heavy Duty C60's. I had a "HL6" Heavy Duty L60 series Low Cab Forward (LCF).
Spanky Hardy Collector Of Fine Old G.M. COE Trucks & Antique Holmes Wreckers
