Editing Iron Duke engine (section)

==Super Duty==
{| class="wikitable floatright"
|+''Super Duty'' Engine Displacements
|-
! Displacement
! Stroke
|-
|{{cvt|131|CID|L|1|disp=flip}}
|{{cvt|2+3/5|in|mm|1}}
|-
|{{cvt|151|CID|L|1|disp=flip}}
|{{cvt|3|in|mm|1}}
|-
|{{cvt|163|CID|L|1|disp=flip}}
|{{cvt|3+1/4|in|mm|1}}
|-
|{{cvt|182|CID|L|1|disp=flip}}
|{{cvt|3+5/8|in|mm|1}}
|-
|{{cvt|198|CID|L|1|disp=flip}}
|{{cvt|3+15/16|in|mm|1}}
|}

The Iron Duke block formed the basis of Pontiac's ''Super Duty'' four-cylinder racing engines of the 1980s, the last in a line of [[Pontiac V8 engine#Super Duty|high-performance Pontiac Super Duty engines]]. The engines were featured in [[NASCAR]]'s [[ISCARS Dash Touring Series|Charlotte/Daytona Dash Series]], the [[IMSA GT Championship]] (in GTP and GTU class cars), and even in [[American Power Boat Association]] racing boats. Super Duty engines continued to be used in [[Automobile Racing Club of America|ARCA]] racing until well into the 2000s.

In addition to parts matching the Iron Duke's stock 2.5-liter displacement other crankshafts and their corresponding connecting rods were offered by Pontiac Motorsports, resulting in displacements ranging from 2.1-liters to 3.2-liters. A 2.7-liter, {{cvt|232|hp|kW|0}} Super Duty engine powered the 1984 [[Pontiac Fiero|Fiero]] [[Indianapolis 500 pace cars|Indy Pace Car]] to over {{cvt|138|mph|km/h}} during the race, but Super Duty engines were never available in factory-built GM vehicles. However, GM sold the Super-Duty-specific parts at authorized dealers and all of the parts required to convert a stock Iron Duke engine to a Super Duty version were available.

Kansas Racing Products continued to make the engines in the early 21st century after buying rights to make them from GM.

[[Cosworth]] also produced a [[Multi-valve#Four valves|16-valve]], double-overhead cam head for the 3.0-liter version of the racing engine ([[Cosworth]] Project DBA, 1987).<ref name="Cosworth Type Reference">{{cite web |url=http://www.race-cars.com/utility/coswrthr.htm |title=Cosworth Type Reference |website=Race-cars.com |access-date=2012-06-04 |archive-date=2011-02-22 |archive-url=https://web.archive.org/web/20110222090951/http://www.race-cars.com/utility/coswrthr.htm |url-status=dead }}</ref>