Did you know, that engine was designed and built in 1927. It was a long stroke slow revving engine of the time. 48 hp. I was later revised to get 63 hp at 4k rpm. This was the main reason Willys got the contract. This engine was later revamped with the F head and more power, still keeping the same bore and stroke. Along life for an old design
One reason the cruising speed was 45/50 was the gearing, 5.38-1. The rpm at 50 mph was app. 2600. The military Jeeps were geared 4.88 but rear diff.won't fit. Different axle.
Just a little history for those interested