Power comes from the IH Black Diamond BD264. It was the “big” light truck engine thru most of the ’50s, having debuted in 1954. It was a stroked derivative of the 220 and 240ci Silver Diamond (SD) engines which had been introduced in 1947. They all shared the same bore but different strokes. They became Black Diamonds in 1955 with a few upgrades. The “Diamond” moniker started in the ’30s and was used as long as these sixes were. The 264 faded away in light trucks after 1959, when the 266ci V-8 became the standard engine. The extra 0.100-inch stroke of the 264 over the 240 delivered a 12hp and 25 lb-ft of torque boost. These were physically big engines that held 7 quarts of oil and had an enviable reliability record. Peak power came at a low 3,800 rpm. In light trucks, the last of the old IHC sixes, the 240ci, was gone by 1969. You will note the hood tilts up from the side. You can open the hood from either side for access. This was a trademark IH feature that ended with the S-Line trucks.