On Chevrolet 1939 - 1955.1 (COE) Cabover Engine models, the Cab is mounted completely over top (100%) of engine. On Chevrolet 1955.2 - 1959 (LCF) Low Cab Forward models, the Cab is mounted forward on the chassis, compared to the conventional models, of the same years, with engine 90% under hood. 1955 was indeed the first year of the Chevrolet LCF. Model run was 55-66. I've owned many, of both. Pictured below are a 53 COE, and 55 LCF, I used to own.
Spanky Hardy Collector Of Fine Old G.M. COE Trucks & Antique Holmes Wreckers