Editing Straight-six engine (section)

===United States===
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 | image1    = 1954HudsonWasp-engine.jpg
 | caption1  = 1954 [[Hudson Wasp]] engine
 | image2    = 1977 Gremlin white azen.jpg
 | caption2  = 1977 [[AMC straight-6 engine]]
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The 1906–1908 [[Ford Model K]] luxury car used a {{convert|405|cuin|L|1|abbr=on}} straight-six petrol engine and was the only Ford six-cylinder passenger car engine until the 1940s. The [[Ford straight-six engine#First generation|Ford flathead I6]] was produced from 1941 until 1951, followed by the [[Ford straight-six engine#Second generation|Ford OHV I6]] overhead valve engine from 1952 through 1964, then the [[Ford straight-six engine#Third generation|Ford Thriftpower Six]] overhead valve engine from 1960 until 1982, and the [[Ford straight-six engine#Fourth generation|Ford 240 I6]] from 1965 through 1972. The [[Ford straight-six engine#300|Ford {{convert|300|cuin|L|1|abbr=on}} version]] of the straight-six engine was built from 1965 until 1996, with notable uses in trucks, SUVs, and vans. However, Ford straight-sixes were replaced by V6 engines in passenger cars during the mid-1970s.

In 1908, the [[Oldsmobile Model Z]] was powered by a flathead straight-six petrol engine, which was produced until 1912 (in the [[Oldsmobile Limited]] luxury car) in displacements of {{convert|453|cuin|L|1|abbr=on}}, {{convert|505|cuin|L|1|abbr=on}} and {{convert|706|cuin|L|1|abbr=on}}. Oldsmobile's next straight-six engine was introduced in the 1913 [[Oldsmobile Six]] luxury car, initially with a displacement of {{convert|380|cuin|L|1|abbr=on}}, followed by a displacement of {{convert|177|cuin|L|1|abbr=on}} for the 1917-1921 [[Oldsmobile Six#Reintroduction|Oldsmobile Model 37]] luxury car. The later generations of the [[Oldsmobile straight-6 engine|Oldsmobile Straight-6]] also used a flathead design from its introduction in the 1923 [[Oldsmobile Model 30]] luxury car until it was replaced in 1950 by Oldsmobile's V8 engine.

The 1913–1929 [[Oakland Six]] luxury car was powered by a flathead petrol engine produced in displacements of {{convert|177|cuin|L|1|abbr=on}} and {{convert|334|cuin|L|1|abbr=on}}. In 1926, the [[Pontiac Six]] was introduced as a lower-cost version of the Oakland six, powered by the [[Pontiac straight-6 engine#"Split Head" Six|Pontiac Split-Head Six]] flathead engine, which used two cylinder heads. This engine was replaced by the 1941–1954 [[Pontiac straight-6 engine#Flathead Six|Pontiac flathead six]]. The unrelated [[Pontiac straight-6 engine#Overhead Valve|Pontiac OHV 6]] overhead valve engine was produced in 1964–1965, based on a Chevrolet design. Pontiac's final straight-six engine was the 1966–1969 [[Pontiac straight-6 engine#Overhead cam|Pontiac OHC 6]] overhead camshaft engine, which was replaced by Chevrolet's straight-six engine and Buick's V6 engine.
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The overhead valve [[Buick Straight-6 engine|Buick Straight-6]] petrol engine was introduced in the 1914 [[Buick Six]] luxury car and was produced until 1930. Buick did not make another six-cylinder engine until they introduced a V6 engine in 1962.

The 1916 through 1926 [[Hudson Super Six]] was powered by a {{convert|289|cuin|L|1|abbr=on}} straight-six petrol engine. This was followed by an [[IOE engine|IOE]] version in 1916. The 1951 [[Hudson Hornet]] introduced a {{convert|308|cuin|L|1|abbr=on}} flathead straight-six engine.<ref>{{cite web|last=Roberts |first=Andrew |title=Classic Cars: The Hornet|work=The Independent|date=19 June 2007 |url= http://classified.independent.co.uk/cars/article2667213.ece |archive-url= https://web.archive.org/web/20090131095328/http://www.independent.co.uk/extras/cars/classic-cars-the-hornet-453564.html |archive-date=31 January 2009|url-status=dead |access-date=26 May 2024}}</ref> These engines dominated dirt track and NASCAR racing at the time.<ref>{{cite web|url= https://bangshift.com/general-news/tech-stories/look-at-the-hudson-308ci-inline-six/ |title=The Other 3/08: Here’s A Look At The Hudson 308ci Inline Six! |date=8 March 2023 |first=Brian |last=Lohnes |website=bangshift.com |access-date=26 May 2024}}</ref><ref>{{cite web|url= https://www.museumofamericanspeed.org/hudson.html |title=Hudson Twin H-Power 6 Cylinder |work=Museum of American Speed |date=2023 |access-date=26 May 2024}}</ref><ref>{{cite web|url= https://www.autoevolution.com/news/the-story-of-the-hudson-hornet-the-forgotten-six-cylinder-muscle-car-167773.html |title=The Story of the Hudson Hornet, the Forgotten Six-Cylinder Muscle Car |date=21 August 2021 |first=Ciprian |last=Flore |website=autoevolution.com |access-date=26 May 2024}}</ref> Production of the Hudson I6 continued after the 1954 merger forming [[American Motors Corporation]] and was eventually replaced by a new [[AMC V8 engine|Rambler V8]] after 1956.

In 1924, Chrysler began production of a straight six version of the [[Chrysler flathead engine|Chrysler flathead]] petrol engine. This was replaced by the 1959–2000 [[Chrysler Slant-6 engine|Chrysler Slant-6]] overhead valve straight-six petrol engine, which was so named due to the 30-degree angle used to reduce the height of the engine (with the trade-off of a wider engine). The Slant-6 was released in the [[Dodge Dart#First generation (1960–1961)|Dodge Dart]] economy car and used in many models until a V6 engine replaced it after 30 years.

The [[Chevrolet Stovebolt engine|Chevrolet Stovebolt]] overhead valve straight-six petrol engine was introduced in 1929 as a replacement for the brand's straight-four engines and was produced in displacements of {{convert|181|cuin|L|1|abbr=on}}, {{convert|194|cuin|L|1|abbr=on}} and {{convert|207|cuin|L|1|abbr=on}}. The second generation of this engine family - often referred to as the [[Chevrolet Stovebolt engine#Second generation: 1937–1962|Blue Flame]] engine - was produced from 1937 to 1962 in displacements of {{convert|216|cuin|L|1|abbr=on}}, {{convert|235|cuin|L|1|abbr=on}} and {{convert|261|cuin|L|1|abbr=on}}. This was followed by the 1962–1988 [[Chevrolet Turbo-Thrift engine]] (also using an overhead valve design), which was replaced by various General Motors V6 engines.

The 1952 through 2006 [[AMC straight-6 engine|AMC Straight-6]] petrol engine initially used a flathead design before being upgraded to an overhead valve design in 1956. A new I6 design with a short stroke and seven [[main bearing]] crankshaft was introduced in 1964.<ref>{{citation |first=David V. |last=Potter |first2=George F |last2=Leydorf, Jr. |first3=Robert L. |last3=Lawler |title=The new Rambler Six Engine - Torque Command 232 (Technical Paper 640276) |publisher=Society of Automotive Engineers |date=June 1964 |doi=10.4271/640276}}</ref> The engine was rugged, reliable, and became noted for longevity. A turbocharged racing engine based on the AMC Straight-6 engine block produced {{convert|875|hp|kW|0|abbr=on}} and competed in the 1978 Indianapolis 500 race.<ref>{{cite web|last=Wilson |first=Michael |title=When the Roar was Red, White & Blue: American Motors and the Indy 500 |url= http://geocities.com/mmbb444/page32.html |archive-url= https://web.archive.org/web/20091025232202/http://geocities.com/mmbb444/page32.html |archive-date=25 October 2009 |access-date=26 May 2024}}</ref><ref>{{cite web|url= https://www.hemmings.com/stories/article/barney-navarro |title= Barney Navarro - Unconventional thinking and hard work put his products in the record books |first=Daniel |last=Strohl |date=23 September 2018 |work=Hemmings |access-date=26 May 2024}}</ref> The final application for the AMC Straight-6 engine was the 2006 [[Jeep Wrangler (TJ)]], after which a V6 replaced it.<ref>{{cite web|url= https://www.motortrend.com/how-to/154-0604-jeeps-kick-ass-engine-history-4-liter/ |title=Jeeps Kick Ass Engine - The History Of The 4.0L |first=Tori |last=Tellem |date=1 April 2006 |work=Motor Trend |access-date=26 May 2024}}</ref>

The 1962 through 1973 [[Jeep Tornado engine|Jeep Tornado]] overhead camshaft straight-six engine was introduced in the [[Willys Jeep Station Wagon]].<ref>{{cite web |url= https://www.ifsja.org/tech/motors/tornado.html |last=Page |first=Ben |title=Tornado 230 CI Engine Information / History |publisher=International Full Size Jeep Association |year=2006 |access-date=26 May 2024}}</ref> At the time of its introduction, the Tornado engine had the lowest specific fuel consumption of an American gasoline (petrol) engine.<ref>{{cite magazine|url= http://www.4wdandsportutility.com/features/jeep/0801_4wd_1963_jeep_wagoneer/history.html |first=Patrick |last=Foster |title=1963 Jeep Wagoneer - Landmark Vehicle |magazine=4Wheel Drive & Sport Utility Magazine |date=January 2008 |url-status=dead |archiveurl= https://web.archive.org/web/20110722115240/http://www.4wdandsportutility.com/features/jeep/0801_4wd_1963_jeep_wagoneer/history.html |archivedate=22 July 2011 |access-date=26 May 2024}}</ref> The Tornado engine was replaced by the AMC I6 engine.

In 2001, General Motors resumed production of straight-six engines with the [[General Motors Atlas engine#LL8 (Vortec 4200)|Vortec 4200]] dual overhead camshaft petrol engine. This engine was used in various SUV models until 2009.<ref>''4200 Overview''</ref> Also, the [[Duramax I6 engine|Duramax Straight-6]] turbocharged diesel engine has been available in several General Motors SUV and light truck models since 2020.<ref>{{cite web |title=2019 Chevrolet Silverado Adds 3.0L Duramax Diesel, Ditches 450 lbs - GM Inside News |url= http://www.gminsidenews.com/articles/2019-chevrolet-silverado-adds-3-0l-duramax-diesel-ditches-450-lbs/ |website=GM Inside News |date=13 January 2018}}</ref>

On March 25, 2022, Stellantis announced their new turbocharged straight-six engine, called Hurricane.<ref>{{cite press release |title=Stellantis Media - Stellantis Debuts Hurricane Twin-turbo I-6 Engine That Cuts Emissions, Increases Fuel Economy And Is More Powerful |url= https://media.stellantisnorthamerica.com/newsrelease.do?id=23660&mid= |access-date=2023-02-03 |website=media.stellantisnorthamerica.com}}</ref> Two outputs are available, a standard {{convert|400|or|500|hp|kW PS|0|abbr=on}} high performance rated at {{convert|450|or|475|lb·ft|N·m}} of torque. The turbos on the Hurricane Standard Output deliver a peak boost of 22 psi, while the Hurricane High Output turbos deliver 26 psi of peak boost. The 3.0&nbsp;L Hurricane is produced at Stellantis’ Saltillo Engine Plant in Mexico.