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2.5 Iron Duke performance parts?

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Old 12-20-2005, 12:59 PM   #1
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Car: 91 Firebird
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2.5 Iron Duke performance parts?

Friend of mine just picked up an '86 red Iron duke last week... Just like to know if there any performance aftermarket for it?
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Old 12-20-2005, 01:05 PM   #2
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Car: 1984 Z28 Hardtop / 1988 IROC T-top
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Axle/Gears: 3.54 Dana 44 / 3.08 10 bolt

Not much of one. If you're interested in performance, you're a lot better off swapping something else in.
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Old 12-20-2005, 02:59 PM   #3
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Car: 1984 Pontiac Firebird
Engine: 2.5L Iron Duke 4 cylinder
Transmission: 5 speed manual

I have yet to see an fbody with an Iron Duke that is an '86. The latest one I've seen or heard of is '84.

I've always read of the fbody getting the duke until '86 but have yet to see one.

-interesting. If your looking for performance parts. Good luck. I would suggest searching the web under S10 or Fiero. You might find some leads.

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Old 12-20-2005, 03:24 PM   #4
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Car: 1991 Z-28
Engine: Can you say stroke?!?!
Transmission: 700-r4
Axle/Gears: 3.42

The parts are out there. Look mainly for stuff involving the rocketblock and superduty, I think. For the most part your are going to get the same responce, which is swap. If your buddy wants to be hard core though, he can build a killer Duke. Just make sure he's prepaired to shell out abuot 25k for it.

The problem with the duke is that the stock parts were built to be light weight and once you start increasing HP and TQ, those parts are going to start needing to be replaced. Mainly the rotating assembly. That's why most of the fiero guys, myself included, are swaping the 2.5 for quad 4's and other things.

Right off he can look for the following parts for it:
Hooker Header(maybe)
Holley Big Bore
Holley Big Bore intake(good luck!)
cam swap
1.7 BB rockers(may need to have studs put in)

That is about it for bolt on's and minor engine work. Next would be extensive. Plus the above would run him $1400, estimated.

Hope that helps.
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