Iron Duke Compatability

[phantomlvii]

Will any Iron Duke fit in an eagle, what about the super duty block that the dirt track guys use.  Will they bolt right in?  I was brainstorming about more power.  I like the idea of a decently powerful 4 cylinder eagle.

[phantomlvii]

anyone?

[nwamcsx]

I could be wrong but I think the important issue is front axle attachment points.  The front axle attaches to the block.  So I would believe this would eliminate the Super Duty.  I need to find out if newer Iron Dukes with EFI have these attachment points, as I would love to put one in my SX/4.  I hear the S-10 pickups have the best block combo.

[phantomlvii]

I am assuming that would out of a 4 wheel drive S-10, for the front axel mounts?

[thereverendbill]

nope, 4wd S-10s use a different 4wd setup (I believe a torque arm).  you could fabricate a subframe that mounts the front diff (kinda like the kit floating around to put a 360 in an eagle).  If I had the chance to take a look at a 4cyl eagle i could probly come up with something that would work.   

[Monkeyjoe]

I just got a call from the machine shop.  They have just finished the work on my Iron Duke.  They bored it out .30 over and polished the crank .10 under.  I think I have finally found a supplier for a flat top piston.  I will be getting the head, block and crank back from the shop next time I am home.  I think I will be able to get a couple more horses out of this little engine yet.  I am also going to port and polish the intake and will be building a set of exhaust headers.

I will let you know how it behaves when I am done.

[phantomlvii]

keep me updated, i would be interested to see how much more power it makes.

[carnuck]

I was thinking about re-powering my '82 Spirit (that is also getting Eagle running gear to make it an SX4) with a 4 cyl AMC motor with EFI from a TJ. It already has a 4.2L so I will probably just finish it off with EFI from a '91 XJ I'm parting. (Rear axle is going to be 3.08 Chrysler 8.25 as soon as I can clear the other rigs out of my garage I'm renting)

I forgot to mention that Iron Dukes came with 2 different patterns. Early ones (up til '80) and ones used in most boats are SBC pattern. Later ones are 2.8 Chev 60 degree pattern (Same as AMC 4 cyl)

[BenM]

I was thinking about re-powering my '82 Spirit (that is also getting Eagle running gear to make it an SX4) with a 4 cyl AMC motor with EFI from a TJ. It already has a 4.2L so I will probably just finish it off with EFI from a '91 XJ I'm parting. (Rear axle is going to be 3.08 Chrysler 8.25 as soon as I can clear the other rigs out of my garage I'm renting)

I've rolled that idea around my own head if I ever get the money to pick up a Kammback. The late AMC 4s were within spitting distance of the late 258s in power and torque. With 3.54 gears and overdrive I'm betting the smaller Eagles would be pretty peppy.

I believe the 4cylinder eagles had a different bracket for the front diff. All the 1980 cars did too.  Also, I don't know if you're familiar with the Fiero forum, they have lots of Iron Duke info.

[eagledreamer]

Greetings,

I know this is an old post but got some info on the Iron Duke... I built one up in the mid 70's and got about 200 hp out of it with some minor mods. I bored it .125 over, from 3.875 to 4.000,  and used 4 inch flat top pistons from a stock 327 Chevy, reworked the head, clearanced the crank, put in an Isky 232 cam, had a custom-built intake designed around a tunnel ram for a small block Chevy with a reworked Holley 500cfm two barrel, dual point distributor and a header. It was a sweet running engine... The engine was built by a guy in Albuquerque that built circle track cars. Some other additions I wanted to but didn't get to were roller rockers, high volume oil pump, electric fan, MSD ignition... and a few more things to get some more giddyup out out of it... For a four cylinder, it had quite a bit snort... Anyway to answer some other questions, the front axle will need a new mount. The older four cylinders had the intake on the drivers side which may have some interference problems with the front driveshaft and I'm not sure about the transmission/bell housing bolt up to the Eagle drivetrain. There are some good books out there on how to build up the Chevy six cylinders which are basically the same as the fours minus two cylinders. There's my two cents worth on the subject.... Questions??? Ask away... I've got six Eagles, wags, SX/4s and a Kammback, I've been playing with for years... Have an Eagle day...  :0)