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The Iron Duke engine (also called 151, 2500, Pontiac 2.5, and Tech IV) is a 151 cu in (2.5 L) straight-4 piston engine built by the Pontiac Motor Division of General Motors from 1977 until 1993. Originally developed as Pontiac's new economy car engine, it was used in a wide variety of vehicles across GM's lineup in the 1980s as well as supplied ...
It also replaced the 250 cu in (4.1 L) in the Chevrolet and GMC full-size trucks and full-size vans, and in 1990, it replaced the 292 cu in (4.8 L) in the Step-Vans as the new base six-cylinder engine. The 4.3 L (262 cu in) V6 has a 4 in × 3.48 in (101.6 mm × 88.4 mm) bore and stroke, identical to the 350 cu in (5.7 L) Chevrolet V8 engine.
The Vortec 2200 (RPO code L43) is an OHV straight-4 truck engine. This engine is equipped with secondary air injection, and is flex-fuel capable. It is entirely different from the Iron Duke, and was the last North American iteration of the GM 122 engine. The 2200 uses an iron block and aluminum two-valve cylinder head.
For 1990, the R/V series was reduced in size for a second time, as the 2500-series 3 ⁄ 4-ton trucks and regular cab trucks were discontinued. 1-ton crew-cab, bonus-cab pickups, and 4 door chassis cabs continued in production by Janesville, as the new GMT400 line had lacked a true crew cab since its introduction. Full-size SUVs continued to be ...
Also, in the fall of 1998, GM introduced the C/K crew cab with the 6.5' bed. It was available in the 2500 or 3500 series and two- or four-wheel drive. The 2500 series was available with the 5.7L or 7.4L V8 gasoline engine, or the 6.5L V8 diesel engine, and came with a GVWR of 8,600 pounds.
262 cu in (4.3 L) V6 Chevrolet 90° V6: 1996–2002 (L35) 2003–2014 (LU3) Standard engine on 1500 and light-duty 2500 vans (was also available on heavy-duty 2500 vans until 2002, and passenger vans until 2006) Final engine derived from original Chevrolet small-block V8 263 cu in (4.3 L) V6 GM 90° V6: 2018–present (LV1) EcoTec3
For the first two years, only a regular cab and 3-door extended cab were available (the 4-door extended cab was added for 2000), along with the 4.3L V6 and the new LS-based 4.8 L, 5.3 L, and 6.0 L V8 engines (a continuation of the 6.5L Detroit turbo diesel engine on 2500 trucks was actually planned, but ultimately cancelled) paired to a 5-speed ...
The big-block 7.4-liter V8 was optional for the 2500 series. The optional 6.5-liter turbo diesel was available for 1994 on 2500 models and from 1995 to 1999 on all models, though rare on the 1500 series. 1500 Suburbans with the 6.5-liter turbo diesel were based on the 2500 series, sharing several mechanical components including the frame, 14 ...