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Hemi Moose · 05-01-2012, 08:15 PM

The Iron Duke (also called the 2500, 151, Pontiac 2.5, Cross Flow, and Tech IV, though the decal on the air filter assemblies actually reads "4 Tech") was a 2.5 L (150.8 cu in) I4 piston engine. All Iron Dukes were built by Pontiac beginning in 1977 and ending in 1993. After this time, the GM 2.2 L OHV 4-cylinder replaced it across the entire lineup of vehicles that offered it.

This 151 was also used by American Motors (AMC) starting in 1980, as the base engine option in the RWD Spirit and Concord, and continuing in both cars through 1982. The AWD (4x4) Eagle carried the 151 as standard equipment for 1981, and carried it midway through the 1983 model year. It was also available (as the Hurricane) in economy model Jeep CJs. AMC replaced the Iron Duke 2.5L I4 with a 150cid Inline-4 of their own, derived from their evergreen sixes.
The Iron Duke is often confused with Chevrolet's Stovebolt-derived 153 from the 1960s Chevy II, but the engines are entirely different - the Iron Duke's intake manifold is on the passenger side, as opposed to the driver side.
Applications:

1977 Pontiac Astre
1977–1980 Pontiac Sunbird
1978–1980 Chevrolet Monza, Oldsmobile Starfire
1980–1982 AMC Concord
1980–1982 AMC Spirit
1980–1983 Jeep CJ
1980–1984 Oldsmobile Omega, Pontiac Phoenix
1980–1985 Buick Skylark, Chevrolet Citation
1981–1983 AMC Eagle
1982–1986 Chevrolet Camaro, Pontiac Firebird
1982–1989 Chevrolet Celebrity
1982–1991 Pontiac 6000
1982–1992 Buick Century, Oldsmobile Cutlass Ciera
1984–1988 Pontiac Fiero
1985–1987 Chevrolet S-10 Blazer, GMC S-15 Jimmy
1985–1993 Chevrolet S-10, GMC S-15/Sonoma
1985–1990 Chevrolet Astro, GMC Safari
1985–1987 Buick Somerset
1985–1991 Pontiac Grand Am, Oldsmobile Cutlass Calais
1986–1991 Buick Skylark
1987–1994 Grumman LLV (USPS delivery vehicle)
1990–1992 Chevrolet Lumina

More written here...

https://en.wikipedia.org/wiki/GM_Iron_Duke_engine

05-01-2012, 08:15 PM	#29
Hemi Moose VIP Member Join Date: Jan 2010 Posts: 2,824 Likes: 0 Liked 12 Times in 12 Posts	Re: Iron Dukes?? The Iron Duke (also called the 2500, 151, Pontiac 2.5, Cross Flow, and Tech IV, though the decal on the air filter assemblies actually reads "4 Tech") was a 2.5 L (150.8 cu in) I4 piston engine. All Iron Dukes were built by Pontiac beginning in 1977 and ending in 1993. After this time, the GM 2.2 L OHV 4-cylinder replaced it across the entire lineup of vehicles that offered it. This 151 was also used by American Motors (AMC) starting in 1980, as the base engine option in the RWD Spirit and Concord, and continuing in both cars through 1982. The AWD (4x4) Eagle carried the 151 as standard equipment for 1981, and carried it midway through the 1983 model year. It was also available (as the Hurricane) in economy model Jeep CJs. AMC replaced the Iron Duke 2.5L I4 with a 150cid Inline-4 of their own, derived from their evergreen sixes. The Iron Duke is often confused with Chevrolet's Stovebolt-derived 153 from the 1960s Chevy II, but the engines are entirely different - the Iron Duke's intake manifold is on the passenger side, as opposed to the driver side. Applications: 1977 Pontiac Astre 1977–1980 Pontiac Sunbird 1978–1980 Chevrolet Monza, Oldsmobile Starfire 1980–1982 AMC Concord 1980–1982 AMC Spirit 1980–1983 Jeep CJ 1980–1984 Oldsmobile Omega, Pontiac Phoenix 1980–1985 Buick Skylark, Chevrolet Citation 1981–1983 AMC Eagle 1982–1986 Chevrolet Camaro, Pontiac Firebird 1982–1989 Chevrolet Celebrity 1982–1991 Pontiac 6000 1982–1992 Buick Century, Oldsmobile Cutlass Ciera 1984–1988 Pontiac Fiero 1985–1987 Chevrolet S-10 Blazer, GMC S-15 Jimmy 1985–1993 Chevrolet S-10, GMC S-15/Sonoma 1985–1990 Chevrolet Astro, GMC Safari 1985–1987 Buick Somerset 1985–1991 Pontiac Grand Am, Oldsmobile Cutlass Calais 1986–1991 Buick Skylark 1987–1994 Grumman LLV (USPS delivery vehicle) 1990–1992 Chevrolet Lumina More written here... https://en.wikipedia.org/wiki/GM_Iron_Duke_engine