Join Date: Apr 2001
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Re: Iron Duke History- who knows the true story!!
I remember it this way:
The GM 151ci 4cyl used in Jeeps from 1980 to something like mid-year 1983 was a Pontiac engine.
The original Iron Duke was a 153ci displacement 4cyl designed (by Chevrolet) to power Chevy's new compact car, the ChevyII (Nova). The new car and both of it's new engines (also a 7 main bearing 6cyl - 230ci I think) debuted in 1962. All three were new designs. The Iron Duke was no performance monster but was durable and trustworthy. Also, I think the ChevyII was the first of the GM X-bodied vehicles.
In the late 70s the Chevy engine was replaced by the Pontiac engine in GM vehicles. The Pontiac Iron Duke had very little, if anything, mechanically in common with the Chevy Iron Duke. I think the name was because it (the Pontiac engine) was designed as a replacement for the original Chevy Iron Duke and GM wanted the 'name recognition' as the Chevy Iron Duke had earned itself a decent reputation. The same Pontiac Iron Duke that was used in many of the small RWD GM vehicles was also used in the CJ line. It also was durable and trustworthy, yet no screamer - like it was intended to be. The Pontiac Iron Duke was the last engine designed & built by Pontiac Motor Division as in the early 80s all GM engine development/engineering was combined from the separate divisions into one body called GM Motors Division or something like that (it has changed and grown since but I can't remember/don't know the details). Throttle body then port injection was added to the Iron Duke in the 80s where our friend also lost it's fine name to the TechIV nomenclature. The bellhousing bolt pattern was changed when the engine was adapted for use in FWD vehicles. Otherwise the engine was still same basic design from the 70s and some parts will interchange, (kinda like the AMC designed 150ci still in Chrysler built Jeeps today) however I don't know if it remains in production now.
I could probably hunt up some reference text to back this information up (if you need it for your 'debate'). Most of the above is from memory of when I did some searching on the history of the engine.