Dec 2008 Location: Boi Angeles, Idaho Posts: 2,862 Re: Identiying an Iron Duke...? GM Iron Duke engine From Wikipedia, the free encyclopedia Iron Duke Manufacturer Pontiac Type Straight-4 Bore 4 in (101.6 mm) Stroke 3 in (76.2 mm) Displacement 151 cu in (2.5 L) Block alloy Iron Head alloy Iron Cooling