"I look at the long, THIN exhaust pipe and think of the restriction it must make - but then the motor's probably a small four-banger. Any idea (I know you know) of the displacement for the motor?"
Quite the deep water fording kit on it - both the intake snorkel and tall exhaust....many (if not all) military jeeps came with 24V systems and full-waterproofing. I know quite a bit about the 1955 and later CJs, but the early flat fenders I am a bit less knowledgeable about, and the military stuff is kind of specialty in its own right - at least in terms of stuff like all the differences of sub models. In any case, all the low hood hood flat fenders, whether military or CJ, would have originally had the L134 'go devil' engine. So 134 cubic inch displacement on a long stroke engine - about 60 hp (gross rating - that would be even less using todays 'brake' rating). The L stands for L-head - basically a flathead engine design. As anemic as it is by todays standards, the go devil was a big reason Willys got the government contract for jeeps....The L134 was later upgraded to the F134 'hurricane' - same block but intake valves were moved over top and that bumped the hp to 70 or so - which is still small, but was a big % increase over the L134. It came about in the early 1950s. Due to its taller height with intake valves on top of block, it doesn't fit under the low hood flat fender jeep - thus the 'ugly duckling' cj3b was temporarily created from the cj3a. Its the one with the tall hood. The round fender jeeps starting with the cj5 in 1955 (and military equivalent m38a1 a few years earlier) were specifically designed to fit the F134. That small displacement 134 block was the base engine in cjs through 1971 when AMC took over. Those little 134 engines were also the standard engine in bigger things like my willys wagon or pick-ups and fc150 and so on. I know it was a different time, and I am not big on huge horsepower etc, but those little 134 engines are just barely suitable for a small cj - can't imagine them on bigger heavier things carrying payload....gearing and reasonable low end torque will get it moving, but it wouldn't go fast. In those days, just having mechanized power to move a heavy load reasonably short distances around farm/ranch, or a few miles along dirt and old country roads into town from neighboring farm communities was all that was needed - a different time indeed.
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