OHV six for 1955 and 1956, V8 only for 1957. The Nash OHV six, dating back to 1934, was a totally different design than the Rambler 195.6. Hudson six-cylinder cars retained the Hudson L-head six, in the Hornet and in the Wasp. This was the only major Hudson component left - it dated back to the 1940s. All Rambler models, whether badged Hudson or Nash, used the Rambler OHV six. This design dates back to 1940, when it was introduced in the Nash 600 as an L-head engine. Displacement was increased over the years to , and finally to 195.6 in the early-1950s. The block casting was changed to allow an OHV head for the 1956 Rambler (the L-head was discontinued). Rambler 195.6 This motor was originally a Nash design dating back to 1940. AMC used an L-head (flat-head, 1955, 1958–65) and OHV (1956–1965) version, as well as an aluminum block version (1961–1963). All shared the same bore and stroke as well as some other features/components. For more information see AMC Straight-6 engine. Kaiser 230 American Motors neither designed the Tornado 230 nor used it in a domestic AMC-branded vehicle. Subsidiary Industrias Kaiser Argentina (IKA) produced this engine in Argentina after the 1970 merger and used it in a variety of vehicles. In the United States, this engine is often confused with the AMC/Jeep , which Kaiser Jeep purchased to replace the SOHC Kaiser engine in 1965. The Tornado first appeared in civilian Jeep vehicles in 1963 and was only used until 1965. The US Army M-715 and derivatives used it through the 1960s and early 1970s. The AMC and Kaiser engines do not share bellhousing bolt patterns. Cam trouble on the 230 was common due to inadequate oil formulations of the time. Its under-square bore and stroke endeared the engine for low-speed torque. It was a dependable engine with reports of them going 250,000 mi. with no major problems—with proper maintenance. Production continued through 1983 in Argentina where AMC used it in passenger cars and Kaiser in Jeeps. Buick 225 Kaiser introduced the "Dauntless" V6 engine in the 1966 CJ and as an option in the C101 Jeepster Commando. Kaiser bought the tooling from Buick to build the 225 during the short period prior to selling its Jeep subsidiary to AMC. American Motors retained the Buick engine briefly after it bought Jeep. The engine was retired in 1971 shortly