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Old 09-03-2006, 02:47 PM
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2.5 iron duke question

i have a 1980 2.5 iron duke out of an amc spirit. its back with an aluminum ford 4 speed. iron dukes have the same bellhousing pattern as a smallblock chevy.my question is is there a flywheel for an automatic trans? id like to use a 350 turbo, i think a flywheel out of an s10 2.5 will be to small for the starter to reach. i call an autoparts store for 1 to its application and i comes up as a junk mopar trans. im just curious about it it only has 18,000 original miles.

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Old 09-03-2006, 04:13 PM
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What about a Chevy Six flexplate? Isn't the Iron Duke just a 250 with two cylinders left out? I know the 250 sixes came with 350 transmission. Good luck.
SimS
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Old 09-03-2006, 04:16 PM
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i never thought about that ill have find me one and see. thanks man
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Old 09-03-2006, 06:49 PM
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Quote:
Originally Posted by SimS
What about a Chevy Six flexplate? Isn't the Iron Duke just a 250 with two cylinders left out? I know the 250 sixes came with 350 transmission. Good luck.
SimS

Not the same engine.
That engine would be a 153, and later on I think there are a couple 181 marine versions.

Cyl head is crossflow on 2.5 Iron Duke motor.
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Old 09-03-2006, 07:11 PM
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actually its a 151 half of a 302 4inch bore 3inch stroke, and it is crossflow
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Old 09-05-2006, 12:02 AM
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Any pre 84 rear wheel drive Chevy application with a 2.5L will have the correct flexplate. The 2.5L didn't go to the smaller bolt pattern in rear drive applications until the 1984 model year. A 1980 S-10 should be correct. Most of the 2.5L engines used a 200 or 250 trans (not sure of designation, but smaller than 350). I'd go ahead with a 200R4 myself, though you'll need some lower rear gears to pull the OD and keep the engine in it's peak torque band. The lower first gear will help a lot though.
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Old 09-05-2006, 06:35 AM
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yea... I did a 2.5L once... you can actually do a lot to them- but at the end its still a 2.5L
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Old 09-05-2006, 08:13 AM
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s10 didnt come out until 1982 and they had isuzu 1.9 and gm 2.0 im not sure but 82 -83 4cylinder only came manual trans, only automatics were on 2.8. if i could just get a flywheel to fit it.
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Old 09-05-2006, 08:41 AM
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GM did build a good many performance parts for that engine back when they were campaigning it in the Fiero GTU. They changed the name to the Tech IV but it was still the same engine, I might be able to dig up some part numbers if I can find the old issue of Road and Track that it's in.
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Old 09-05-2006, 08:56 AM
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I have an ironduke in my '88 Astro Van. It's got a 700R4 behind it. Finding a flexplate shouldn't be a problem.
Mark
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Old 09-05-2006, 09:48 AM
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Quote:
Originally Posted by astroracer
I have an ironduke in my '88 Astro Van. It's got a 700R4 behind it. Finding a flexplate shouldn't be a problem.
Mark
from what i understand that iron duke is, is that it has the same bellhousing pattern as a smallblock chevy. s10s astros, atc. factory had a narrower pattern. the flywheel off them will not reach the starter. i wouldnt call them an iron duke from what i know.
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Old 09-05-2006, 09:49 AM
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unless yours is not original
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Old 09-05-2006, 10:58 AM
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It's original. I really don't know that much about the motor. It has a 700R4 bolted to it and it leaks oil around the rocker cover gasket... That's about it. When I bought tune-up parts for it the counter guy called it an iron duke so that's why I chimed in...
Mark
EDIT:
Did a quick search under iron duke and came up with some info. Check it out. I think you find your answer here:
http://www.answers.com/topic/gm-iron-duke-engine

Last edited by astroracer; 09-05-2006 at 11:07 AM.
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