Iron Duke engine 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 to 1993. Thereafter GM's 2.2 L OHV 4 cylinder replaced it across the entire lineup of vehicles that offered it. GM Parts Center | The Iron Duke GM's Worst Engine Ever ... The Iron Duke was a 4 cylinder, cast iron pushrod engine born from oil shortages and government standards that demanded cleaner vehicles. The Iron Duke would see itself in a slew of GM's vehicles during its production run from 1977 to 1993, including Pontiac Sunbirds, Chevy Blazers, GMC Safaris, Buick Centurys, and most notably, the Camaro. GM 2.5 Iron Duke Specifications | It Still Runs For General Motors, the engine of choice was the Iron Duke, a four cylinder inline engine with an iron block and head. Engine Specifications In 1977 Pontiac began production of the 2.5 L engine. Riding with the Iron Duke Engine Builder Magazine After being stung by the unreliable Vega ­engine, Pontiac played it safe with the Iron Duke 2.5L I4 engine. pared to the Vega engine, this was a step back to an iron block and push rods. But, the Iron Duke was ­designed to last a long time and give American drivers the low end torque they expected. Cut Down Engine of the Week: GM Iron Duke | Get the latest ... Iron Duke engine in 1991 Pontiac Grand Am In the aftermath of the 1973 Oil Crisis, General Motors needed a cheap, reliable inline four engine in a hurry. Pontiac 2.5 Engine Build Information most 2.5 engines. Part # is 1539 (1978 Pontiac 151 Iron duke) (all same dimensions as Pontiac 301 v8 pistons). Standard 4 inch bore 1.57 compression height Pin Diameter 0.9273 Rings: 2 – 5 64 1 – 3 16 KB silvolite Pontiac 2.5 Engine Block Information 2.5L 151 c.u.i. 92 hp 4 cylinder "Iron Duke" Pontiac 4.00 inch bore x 3.00 inch stroke.

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