Editing Iron Duke engine (section)

==Early applications==

The Iron Duke's first applications were in the 1977 [[Pontiac Astre|Astre]] and [[Pontiac Sunbird#First generation (1976–1980)|Sunbird]] subcompact cars, replacing the 2.3-liter Vega engine, and in the compact [[Pontiac Phoenix#First generation (1977–1979)|Phoenix]]. As these cars were originally designed for Chevrolet engines, the Iron Duke also used the Chevrolet [[bell housing|bell housing bolt pattern]], instead of the Buick-Oldsmobile-Pontiac V8 pattern. The following year use of the engine expanded to the Sunbird's Chevrolet and [[Oldsmobile]] twins, the [[Chevrolet Monza|Monza]] and [[Oldsmobile Starfire#Second generation (1975–1980)|Starfire]].

For the 1979 model year, the engine was extensively redesigned. The original [[reverse-flow cylinder head]] was replaced by a [[Crossflow cylinder head|crossflow design]], a new two-barrel carburetor called "Vara-Jet" was introduced, the [[distributor]] was relocated, and the size of the oil pan was reduced. The only parts carried over from the 1978 engines were the connecting rods.<ref name="PopMech1978">{{cite magazine|last=Weissler |first=Paul |date=November 1978 |title=Servicing the '79 GM Cars |url= https://books.google.com/books?id=oM8DAAAAMBAJ |pages=162–164 |magazine=Popular Mechanics |access-date=17 August 2019}}</ref> Peak power increased to 90&nbsp;hp.

For 1980 the Iron Duke engine was redesigned to be mounted transversely, to suit the new [[front-wheel-drive|front-drive]] [[GM X platform (1980)|General Motors "X-body" cars]]. The bellhousing bolt pattern was revised to match that of the new [[General Motors 60° V6 engine|60° V6 engine]].

[[File:1982 AMC Spirit liftback in Vintage Red metallic at PA meet 7of8.jpg|thumb|1982 [[AMC Spirit]] with Iron Duke]]
GM also began selling the engine to [[American Motors Corporation]] (AMC) starting with the 1980 model year. It was the base engine in [[AMC Spirit|Spirit]], [[AMC Concord|Concord]], and [[AMC Eagle|Eagle]] automobiles, as well as in base-model [[Jeep CJ]]s.<ref>{{cite web |last1=Martin |first1=Murilee |title=1982: Luxurious AMC Concord gets Ziebart no-rust, GM Iron Duke power |url= https://www.autoweek.com/car-life/classic-cars/a1832536/1982-luxurious-amc-concord-gets-ziebart-no-rust-gm-iron-duke-power/ |work=Autoweek |date=11 October 2017 |access-date=January 20, 2023}}</ref> The engines purchased by AMC continued to use the Chevrolet V8 bellhousing pattern. The four-cylinder engine was discontinued from AMC's rear-wheel drive models after 1982. During 1983, the all-wheel drive Eagle base engine switched from the Iron Duke to a new, AMC-developed {{cvt|150|cid|L|1}} [[AMC straight-4 engine|four-cylinder]]. The 1980 through 1983 Jeep CJs were also available with the Iron Duke as the base engine.<ref>{{cite web |title=Jeep Engine: GM 151 |url= https://www.jeeptech.com/engine/gm151.html |website=jeeptech.com |date=December 1, 2010 |access-date=January 20, 2023}}</ref>

{| cellpadding="2" cellspacing="2" style="margin:0 0 1em 1em; border:3px solid skyBlue;"
|-
!Year
!Power
!Torque
|-
|1978
|{{cvt|85|hp|kW|0}} at 4400&nbsp;rpm<ref name="PopSci1978">{{cite magazine|title=Small-engine sport sedans—good handling, tame performance |date=August 1978 |author-link=Jim Dunne (automotive spy photographer) |first1=Jim |last1=Dunne |last2=Jacobs |first2=Ed |magazine=Popular Science |url= https://books.google.com/books?id=BwEAAAAAMBAJ |access-date=18 August 2019}}</ref>{{rp|40}}
|{{cvt|123|lbft|Nm|0}} at 2800&nbsp;rpm{{r|PopSci1978|p=40}}
|-
|1979
|{{cvt|90|hp|kW|0}}
|{{cvt|128|lbft|Nm|0}}
|-
|1980
|{{cvt|90|hp|kW|0}} at 4000&nbsp;rpm<ref name="PopSciXcars">{{cite magazine|title=GM's X-cars challenge traditional compacts |date=July 1979 |first1=Jim |last1=Dunne |last2=Jacobs |first2=Ed |magazine=Popular Science |url= https://books.google.com/books?id=NQEAAAAAMBAJ |access-date=18 August 2019}}</ref>{{rp|47}}
|{{cvt|134|lbft|Nm|0}} at 2400&nbsp;rpm{{r|PopSciXcars|p=47}}
|-
|1981
|{{cvt|84|hp|kW|0}} at 4000&nbsp;rpm<ref name="PopSci1981">{{cite magazine|first1=Jim |last1=Dunne |last2=Jacobs |first2=Ed |date=March 1981 |title=U.S. compacts: Is Chrysler's K-car the new champ? |url= https://books.google.com/books?id=z7nkfLrLoMsC |page=46 |magazine=Popular Science |access-date=27 August 2019}}</ref>
|{{cvt|125|lbft|Nm|0}} at 2400&nbsp;rpm{{r|PopSci1981}}
|}

{{hidden begin
|title      = Applications:
|titlestyle = background:#88FF88; text-align:left;
|bodystyle  = text-align:left;
}}
* 1981–1982 [[AMC Concord]]
* 1981–1983 [[AMC Eagle]]
* 1980–1982 [[AMC Spirit]]
* 1980–1981 [[Buick Skylark]]
* 1980–1981 [[Chevrolet Citation]]
* 1978–1980 [[Chevrolet Monza]]
* 1980–1983 [[Jeep CJ]]
* 1980–1981 [[Oldsmobile Omega]]
* 1978–1980 [[Oldsmobile Starfire]]
* 1977 [[Pontiac Astre]]
* 1977–1981 [[Pontiac Phoenix]]
* 1977–1980 [[Pontiac Sunbird]]
* 1977 [[Pontiac_Ventura#1971–1977|Pontiac Ventura]]
{{hidden end}}