The Willys F4-134 Hurricane was an inline-4 piston engine and powered the famous Jeep CJ in the CJ-3B, CJ-5, and CJ-6 models. It was also used in the Willys 473 and 475 pickups, wagons, and sedan deliveries. It replaced the Willys Go Devil engine that was used in the MB Jeep and other early Jeep-based models like the Jeepster. This engine was also built by Mitsubishi for their license-built Jeep, as well as other applications. Design The Hurricane was based on the earlier Go-Devil flathead engine. To get more power from the engine, the induction system was changed from the Go-Devil's side-valve configuration to an inlet-over-exhaust configuration, or "F-head". This allowed the valves to be larger and the combustion chamber to be smaller, improving flow and increasing the compression ratio. The compression ratio rose from 6.5:1 in the Go-Devil engine to 7.5:1 in the Hurricane engine, although a version of the Hurricane engine was made with a 6.9:1 compression ratio. F134 The L134 Go Devil was updated with the F-head to become the F134 in 1950. This engine produced a gross output of at 4000 rpm and of torque at 2000 rpm with a 7.5:1 compression ratio. The gross power and torque outputs fell to and respectively when the engine had a 6.9:1 compression ratio. Bore and stroke dimensions were the same as the L-head engine at " x " giving . The F4-134 was introduced in 1950 in the Jeep Truck. Vehicles with this engine were given the model designation 4-73. This engine was not placed in a CJ until the introduction of the CJ-3B in 1953, which had a distinctive high hood to accommodate the much taller engine. The engine remained in production until 1971, after American Motors Corporation (AMC) purchased Kaiser Jeep. Applications: 1950–1961 Willys Jeep Truck 1950–1961 Willys Jeep Wagon 1950 Willys-Overland Jeepster 1952–1971 Willys M38A1 1953 Willys 475A Lark 1953–1968 Willys CJ-3B 1955–1971 CJ-5 1956–1971 CJ-6 1965-1967 DJ-5 1966–1971 Jeepster Commando F161 The F6-161 Hurricane is an F-head version of the L6-161 Lightning flathead straight six. It was used in the Model 685 Station Wagon. BF-161 The BF-161 has a inch bore and a inch stroke, a one-barrel carburetor, and an output of at 4400 rpm and of torque at 2000 rpm. Its displacement features a compression ratio of 7.6:1. 2600 The 2600 was essentially the same BF-161 engine made in Brazil by Willys-Overland's subsidiary,