2.5L 4cyl engine GM AMC ??? HELP me identify this motor - JeepForum.com
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post #1 of 8 Old 04-06-2021, 04:33 PM Thread Starter
Tinman1
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2.5L 4cyl engine GM AMC ??? HELP me identify this motor

I have been trying to identify this 4cyl motor I have in my 80 CJ5 Anyone have a clue on what it could be? I was told it's out of a Chevy.. Mabey an S10 or similar..

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post #2 of 8 Old 04-06-2021, 04:59 PM
RiverandSand
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If it's the original motor, it would be the "Iron Duke" GM 4 cyl. AMC used them up to 82, then went to an AMC 4 cyl. There will be a stamped ID on the block which should help ID the motor.
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post #3 of 8 Old 04-06-2021, 05:05 PM
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GM 2.5 four cylinder. Stock engine for 80-82
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post #4 of 8 Old 04-08-2021, 07:03 AM Thread Starter
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Thanks. The only numbers I found on the drivers side of the block are: 10009542-1

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post #5 of 8 Old 04-08-2021, 07:29 AM Thread Starter
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How can I clean up all these hoses??? Are they really necessary? We don't have any emissions here in NC.

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post #6 of 8 Old 04-08-2021, 09:39 AM
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If you take off any emissions "junk", I'm sure someone in an emissions required state, would love to have the parts
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post #7 of 8 Old 04-08-2021, 11:09 AM
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The number you found on the block confirms it is a Iron Duke 151 CI inline 4 developed & engineered by Pontiac. Basically you have a Pontiac engine in your AMC. That engine was a product of the times, which was the mid seventies. The Chevrolet Vega 4 cylinder wasn’t very successful and had cost a lot in revenues due to warranty claims. Pontiac engineer John Sawruk (RIP) set about to design a robust & reliable 4 cylinder engine that was good on gas, hence the “Iron Duke” name. Fuel milage was an important factor in the seventies. This Iron Duke engine is a result of John Sawruks engineering team. GM went on to use this engine in many other GM product lines across the board, which will lead many to refer to it as a GM engine. I believe it was used up through the nineties.

The use of this engine is a complete opposite of what GM currently does, and did with the LS series engines, for example.

GM developed & engineered the LS series, and then they were or are used in different GM product lines, like Chevrolet, Pontiac (RIP) and Buick, for example. The Iron Duke was developed & engineered by Pontiac, and then GM used them in other product lines like Chevrolet, Buick, Oldsmobile (RIP) and many others, including selling them to AMC.

There was a time when engine loyalty was integral to automotive marketing. As a result, there was an old saying “Win on Sunday, sell on Monday” however; times have changed over the years. All of the current NASCAR race cars look the same, they don’t even look like any particular car, no more brand loyalty in my opinion.
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post #8 of 8 Old 04-08-2021, 11:52 AM
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Quote:
Originally Posted by Tinman1 View Post
How can I clean up all these hoses??? Are they really necessary? We don't have any emissions here in NC.
There ist not really much emissions junk on the iron duke. You certainly want to keep the egr valve. And then there is only the evap canister which doesn't hurt performance but keeps your jeep from being smelly.

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