Hy Mathieu, welcome, all my research on Maple Leaf trucks leads me to believe that they were only made up to 1950. The two and a half tons [16 series] were powered by Chevy engines, but from 1939 to 1950 the three tons [17 series] were powered by GMC full precision bearinged engines, the 248 being the standard engine. Maple Leaf trucks did not have a special serial number, but were the two largest Canadian produced Chevrolets, the 16 series [2 1/2 ton], and the 17 series [3 ton], these trucks used many parts normally associated with GMCs, Motor wheels, rather than Kelsey wheels being the most obvious. The way I usually describe a 3 ton Maple Leaf to someone who knows nothing about them is to say that they are basically a GMC truck, with Chevrolet front end sheet metal, hope that helps.
