Old Marine Engine: Does anyone know what 4 cyl GM this is????
Hot Rods - Iron duke in a model A | The H.A.M.B.
Iron Duke Engine Guide - Reliability, problems, & fuel economy.
Cut-Down Engine of the Week: GM Iron Duke
For the last time, the Iron Duke was not the same engine as the Chevy II four-cylinder | Hemmings
The Little Engines That Could, Part 4: Chevy II 153 Four – Six Minus Two Equals Roughly Unpopular | Curbside Classic
Is the Iron Duke Engine Bad?
Rebuilt GM Iron Duke Engines Lowered in Price for Buyers at RemanufacturedEnginesforSale.com
2.5L Iron Duke crate engine for sale - at Hershey til Thursday - Automobiles and Parts - Buy/Sell - Antique Automobile Club of America - Discussion Forums
Iron Duke engine - Wikipedia
Junkyard Outtake: Put Up Your (Iron) Dukes | Curbside Classic
GM 2.5L Iron Duke I4 Engine Guide | Junkyard Mob
Cut-Down Engine of the Week: GM Iron Duke
Iron Duke Community | Facebook
What Was The Iron Duke? | The Daily Drive | Consumer Guide®
GM's Unkillable Iron Duke 4-Cylinder Engine Powered Dozens Of Trucks, Cars, and SUVs For Decades | DrivingLine