The 707 was from back in the 30's. I'm not sure it was still available in 1950. I have only seen one in my life. It had a direct coupled air compressor and two spark plugs per cylinder. It was about the same size as the 855 block Cummins Diesel used for about 50 years. Fully dressed, a Cummins weights close to 4,000 lbs and were only used in the largest conventional cabs. A 302 was the largest engine that was feasible to retrofit into a Chev of the era pictured. However the 302 wasn't released until 1952. The International captured a large portion of the market in its class with the RD450 in the R190 series truck which was introduced in 1954.
