I know I need a good cam and a stroker crank and a few other things. Can anyone help me on where to find some of the parts. I have looked all over and cant find a stroker crank.

Try the iron duke group on yahoo. It'll tell ya all about the marine crank to use as well as misc. other small block parts. Good Luck.. And oh yea, I wudn't start with the fiero duke block.

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19 Year Old Fierophile.
--1986 GT Daily Driver, 4:10s, NX 50 Shot, Borla exhaust, ported manifolds, and a few other goodies
--1984 SE 4.9, IMSA spoiler, Duel exhuast, GT rear bumper, Konis, drop spindles, Rear adjustable perch, Poly total kit, Poly cradle bushings, Big front bar, Added rear bar, 11.25" brakes on all corners w/SS hoses, Fancy wheels wrapped w/soft rubber, and much much more.

AFAIK the duke is not a 200HP engine.. Try a Quad 4 swap if you want some HP and keep the good MPG.

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'85 Fiero 2m4

Nederlands Fiero forum

TWO dukes welded together with some other mods to give each 100 HP each. This is by far the easiest and cheapest way to get 200 HP from a duke.......LOL!

Phil

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GTDude
OVER 25 years GM experience

quote Originally posted by Morninglight: Try a Quad 4 swap if you want some HP and keep the good MPG.

I'll never understand the concept or concern for MPG if you are building a hyperformance engine. If one is worried that much about MPG then keep it stock or build it for that.

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AMEN.........AMEN.........AMEN!!!!!!!!!!!!

Phil

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GTDude
OVER 25 years GM experience

Iron duke = half of a 350

Nope....iron duke equals one half of a 301 Pontiac engine. Even the pistons are the same. Also a weak low end engine.

Phil

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GTDude
OVER 25 years GM experience

quote Originally posted by gargoyle: I'll never understand the concept or concern for MPG if you are building a hyperformance engine. If one is worried that much about MPG then keep it stock or build it for that.

If you optimize an engine the right way it will produce more HP and still have good MPG.

My last car was a Golf GTI 16v with ~155HP (stock=129hp) and it still ran about the same MPG as when it was stock under the same circumstances ofcourse The art of tuning

Turbocharging an engine can even lead to better better MPG with more HP.. go figure

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'85 Fiero 2m4

Nederlands Fiero forum

[This message has been edited by Morninglight (edited 11-02-2002).]

hmmm, how to make a 200hp duke? Well first you start by taking it out of your car...then tie a long string to it.....and use it to anchor your boat.....then install a 3800 or a 4.9......

Naw just givin ya a hard time, this is actually a project i wanna try out someday, carbureted with 4 individual carbs, headers, high compression pistons, ect ect ect.

Someone mentioned a duke forum? whats the URL?

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'88 Red SE (4.9 PFI, 4T60E 4speed O/D trans, Custom cradle) Engine installed! Fastback conversion begins.....the fun just keeps multiplying!

Thought this might help.

10045437-Aluminum cylinder head This 2.5 special aluminum cylinder head is a race winning design for the four cylinder Pontiac Aluminum "Super Duty" that's proven itself in IMSA road racing and Competition Eliminator series. This rugged, lightweight head gives you Pontiac and NASCAR quality with plenty of extra metal, and proven performance with totally redesigned, super free-flowing ports. Oversize ductile iron seats and phosphorus bronze guides are standard. Intake volume is 178cc. This head accepts standard four-cylinder intake port centerline manifolds.:
347056-Four Cylnder Performance Head:
This cast-iron performance head is designed to be used on 151ci or 153ci 4 cylinder engines.:
10031322-Cast-Iron head W/O EGR:
10031323-Cast-Iron head with EGR:

10093306-Cast Iron Super Duty Block Pontiac Motorsports' four cylinderSuper Duty block is cast specially formulated grey iron with a tensile strength of over 47,000 psi. This premium material strengthens the casting and improves ring seal. The Super Duty block has rough-bored 3.750" diameter cylinders; the walls are siamesed to optimize coolant flow around the bores. The cylinder barrels are lengthened to accomodate long-stroke crankshafts. The two-bolt main bearing caps are installed with 1/2-13NC Grade eight bolts; the reinforced head bolt bosses are also tapped for 1/2" fasteners. This block has provisions for left or right-hand starter motors.:
TECHNICAL NOTE: This block uses five needle roller camshaft bearings. Bearings and camshafts are availible from aftermarket manufacturers.:

By 1984 Pontiac had an interesting project assignment for us: The Pontiac Fiero for IMSA GTU competition. We developed the Super-Duty 4-cylinder engine which proved extremely potent in many forms of racing.

In 1985- 1986, Bob Earl and Terry Visger drove our Pontiac Fiero’s in the IMSA GTU events. In 27 races Bob earned 16 pole positions (nine records), scored ten victories ( led 23 races), and set ten fastest race laps, (6 records). Terry continued that trend.

All in all, 15 Huffaker Fiero racecars were produced. These racecars and engines are still winning championships in Puerto Rico. Please see: www.jorgediaz.com

In 1987 we added an IMSA GT-Lights car to our stable. We purchase a Spice chassis to utilize our Pontiac Super-Duty development program. More records and more wins culminating with combination GTU and GT-Lights entries at the 1989 Sebring 12 hr. endurance race where we won with both classes, a record for a single team that still stands. The Huffaker racing team won the pit-stop competition every year we entered, beating out all of the factory teams as well. Drivers: Dan Marvin & Terry Visger set the records. Others that shared driving chores from time to time were: Domimic Dobson, Bob Lesnett, Bruce Qvale, Dave Rocha, Parker Johnstone among others.

Thanks for the info I have a Super Duty block with Lunati/Oliver Billet rods I have the I am tring to get the Super Duty head 10045437 and Super Duty Intake manifold 10038470 for a 4bbl carb from the same guy that I got the block from. The head has 2.02 Intake and 1.625 Exhust valves in it.

half of a 301? wouldnt it be half of a 305? half of a 301 wouldnt be 2.5L half of a 305 would, i could be wrong but i always heard it was half of a 305

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--Adam--
1987 Blue GT 5-speed
IM AOL: GTFiero
Remember, always brush your milk, drink your teeth, dont do sleep and get eight hours of drugs

remember, Drive it like you stole it...nice and slow so you dont get your @$$ caught by the cops

What is 1/2 of 301 cu in? Actually it's 150.5 or a 151 which is what the duke is. Pistons fit, rods fit, one of the cyl heads fits I think on some models. I used to be a Pontiac dealer.

Phil

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GTDude
OVER 25 years GM experience

quote Originally posted by DRA: Thought this might help. 10045437-Aluminum cylinder head 347056-Four Cylnder Performance Head: 10031322-Cast-Iron head W/O EGR: 10031323-Cast-Iron head with EGR: 10093306-Cast Iron Super Duty Block

Great info, but how many of these parts are still available?

200 HP iron duke? Luck, and a few extra blocks laying around when the original grenades itself

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1988 Quad 4 Coupe 5 speed
More pics of the coupe
1986 GT 5 speed, 1984 SC Auto
AOL: LastMinuteBastrd AIM: SavedbyJebus

Steel crank, rods and supercharger here at www.mantapart.com

Amazing just how many people feel they have to rag on the Duke. Did you all hear the phrase "if you dont have anything nice to say..."

Steven

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88 Fiero coupe 2.5 5 speed, Custom IHI RHB6 turbo equipped, gutted and track abused
87 Fiero GT 14.9/ 89mph CSP car
87 Mazda RX-7 SBC v8 5.0L/700R4 ---FOR SALE
84 Fiero 2M4 T-top, Turbocharged and tons of extras!
87 Conquest TSi 406 SBC V8!
93 Lumina Z34 organ donor :)

quote Originally posted by GTFiero1: half of a 301? wouldnt it be half of a 305? half of a 301 wouldnt be 2.5L half of a 305 would, i could be wrong but i always heard it was half of a 305

Well, not to argue numbers, but the 305 is a Chevy engine. The 301 and Iron Duke are Pontiac engines. The 2.5L Iron Duke is half of the 301 (5.0L) Pontiac engine.

It has nothing to do with any Chevy engine.

quote Originally posted by Ironduke25: Thanks for the info I have a Super Duty block with Lunati/Oliver Billet rods I have the I am tring to get the Super Duty head 10045437 and Super Duty Intake manifold 10038470 for a 4bbl carb from the same guy that I got the block from. The head has 2.02 Intake and 1.625 Exhust valves in it.

Why are you asking us how to get 200hp from a duke?? You are already on your way to well over 200hp if you can snag up that head and intake!

After that, all you need is some good carb tuning, a nice big open exhaust and you're good to go!

Edit: Oh I see you still need a crank. Best bet is probably the Mercruiser crank, unless you can find a superduty one. And you should probably look into what the SD4 cam specs were and get one custom ground to those specs.

What are you running for pistons? Once again, I would suggest going with some custom made forged one's. You could probably get some custom made to run in excess of 10:1 compression.

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[This message has been edited by AkursedX (edited 11-12-2002).]

FYI, a Super Duty Iron Duke cost about $15,000 to build back in the '80's. Good luck finding the correct parts now. Yes, it can be done, and for some that's reason enough. To me, it's much too much work and money for the return on investment you get.

But that's what makes hot rodding so much fun! All the original ideas!

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--------------Forever In My Heart----------------
Jack Daniel Miller --- Dec. 29, 1925 - Oct. 14, 2002
Ruby Cantrell Miller - Jan. 20, 1932 - Aug. 31, 2002
It won't rain all the time. The Sky won't fall forever,
And tho' the night seems long, Your tears won't fall forever.

Thanks I found the 3.0 storker crank and you can get super duty parts from gm. I guess I will be getting the head and intake from gm. I will let you know how it goes.

It would be much cheaper to do a swap, or there is always a 100 shot of NOS, summit racing $500.00ish. LOL

Ed

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http://hometown.aol.com/idomy0wnracing

Car Driver: Jorge Diaz JR
Manufacturer: Spice of England
Modifications By: Huffaker of California
Engine: 3.0 Liter inline 4
Power: 341 hp 268 Torque
Body: Fiero GT
Number: 10
Gearbox: Close ratio 5 speed
Weight: 2100 pounds by regulations, 2200 pounds here in Puerto Rico.

Fieroman

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~ Shane
AIM: fieroman500

Love it, admire it....tear it apart!

I believe that 200 Hp from the Duke Engine will be hard to achieve. Anything can be done if you spend enough money but one needs to consider the cost per HP value. IMO a 200 HP swap would be less expensive than trying to build a 200HP Duke
For the best bang for the buck I would just hang on a Turbo with 5-6 psi boost and start tuning. This would give the Duke near 2.8L V6 performance. According to the Pfaff dyno tests done in 1985 the turbo Duke engine provided about 135 horepower. That's sure to provide more driving excitement.

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87GT 3.4 Turbo Best 0-60 5.2 seconds
http://turbofiero.fierojoe.com/turbo.htm

A 200HP Iron Duke is definately not the economical way to go, but if you use Super Duty parts, it's achievable. You'll need the Super Duty block, heads, crank, pretty much everything. The stock 2.5L parts just won't hold up to that power level, but the Super Duty parts will.