Hy Napco Man, the owner is not exactly correct in his description. The two largest series Chevrolet trucks built in Canada from the early 30s to 1950 were Maple Leaf trucks. In 1939 GMC came out with there full pressure lubed engines [228 -302] from that point on the 16 series [2 1/2 ton] were powered by Chevrolet engines and the 17 series [3 ton] were powered by GMC engines. The 17 series was the largest Chevrolet Maple Leaf available. Gmcs that were larger than these Chevrolets were identical to there American cousins, hope that helps.