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Re: 4 cylinder '67 C-10
The 153 Chevy II engine was never called the Iron Duke. The Iron Duke was the 2.5L 151 cu in Pontiac built engine. I have an old magazine from 1977 introducing the Iron Duke . My 1982 Camaro owners manual refers to the 4 cyl engine in the Camaro as the 2.5L "Iron Duke". I do agree that the 153 is a better engine. My granddather had a old inboard boat built in 60's with a 153, and ran it all the way up until about 5 years ago with engine problems in all those years. I think some people have sorta retronamed both of the engines the 151 and 153 Iron Duke, but its not correct to my knowledge. I can't find any factory literature referring to the 153 as an Iron Duke engine.
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