As for building up the Duke, here the the tall and short of it. The stock Duke has a small weak crank. This is it's achillies heel. Yes, you can get 200hp out of it but the price is that the engine will last exactly 10 seconds. That is why the Super Duty motor was built to begin with. for all the short comings of the stock Duke, the Super Duty is simply WORLD CLASS! It is as old as the hills and yet it is STILL the quintesential 4-banger on the racing circuit.

YES! Maniak is in da house! Now show us your cool drawings!

Basically everything he said I agree with. I good way to find out what works to make more HP out of any engine is by way of it being tried before. If it was so simple to push 200 + hp on a duke why aren't there many out there being driven by the people on this very forum? Maybe his(88Fiero2m4) friends have some great ways of getting cheap hp, but not like they way he posted.

Lookie here..it's Toddster , the man with the delusion that this is ""Toddsters Fiero forum" Don't disagree with him , he will cry to Cliff. It's funny Toddster , you claim a 152 IQ , yet simple humour that a 5yr old could comprehend you baffles you to no end... can you figure this out?

The Super Duty is world class?? have you looked at a calendar latley there Chump?? it's 2004 , not 1985 and the superduty with it's single cam is a dinosaur. (please don't bother blah blah blahing on about the SBC) To think that an engine designed nearly 2 decades ago without revision , aftermarket support or any kind of advancement is world class reflects your true intelligence whe it comes to engines. Gee toddster , you know you can get 4cyls with 300hp now?? LIVE IN THE NOW!!. compared to the technologies in the Ecotec it's not world class.... it's a cambodian taxi motor. What racing circuits do they use these on??

PS where are the dyno slips for the 126hp chochie?? your guesstimate 126hp?? same way you guess that IQ of yours ?? are you proud of 126hp when even a junkyard 2.8 or 3.1 would make buttloads more power for 1/4 the cost of rebuilding that dried turd? The truth hurts.

JM
THE SBC PUNISHER

If your goal is to match the speed and acceleration of a stock V-6 fiero, I would first start out with the simple stuff. Better flowing air intake, better flowing exhaust, weight savings where ever possible. All the basics have been said in posts above.

Well just to clear up some facts:
The SD4 is still in use today. It is the authorized engine for the ARCA racing circuit. As well as many race boat classes.
Kansas Racing Products bought the rights to continue to supply the SD4 engines. The Original GM SD4 heads are not used due to the expense. They now use Chevy 2.02 heads or Ford SVO heads. (can be machined for Mopar heads too) KRP even made updates to the block and sells parts to completed engines.

http://www.kansasracingproducts.com/history.html

The Ecotec is nothing but a re-designed version of the QUAD4 which is almost as old as the SD4. (Pontiac designed/built the SD4, and Oldsmobile designed/built the QUAD4)

The Ecotec requires forced induction to match the horsepower and torque of a normally aspirated SD4.
The ARCA specs have the 2.7L SD4's pushing 275-280hp normally aspirated. For $8500 KRP will sell you a "streetable" 230hp 2.7L SD4 or for $800 more You can get it stroked to 3.0L and have 250hp. These are normally aspirated and very strong engines. Add forced induction and you can hit 350hp easily.

(I know costs because I was actually looking at buying one. I have 2 "build sheets" from them)

Here is a sample of the blocks features:

Block Features Include:

- Siamesed cylinder block construction for extra strength and overbore to 4.125 inches

- Wet or dry sump oiling system (extra cost for internal oil pump installation)

- .625" thick deck to minimize bore distortion

- Block accepts popular brands of small block V8 cylinder heads

- Accepts several styles of Pontiac cylinder heads from "Super Duty" block

- Direct replacement for Pontiac "Super Duty" block with same bolt pattern and component parts

- Accepts all of the internal and external component parts from Fontana 4-cylinder aluminum block

- Less expensive than aluminum

- 9.166 inches deck height

- Bores from 3.875 to 4.125 inches

- Strokes to 4"

- Displacements from 140 to 213 cubic inches

- Beefy .875 inch thick main webs

- High performance ductile main caps (included free with block-only orders)

- 1/2 inch head and main stud holes penetrate block a full 1.75 threaded inches

- Large main oil gallery

- Accepts Chevy II oil pan, Pontiac 2.5 oil pan or aftermarket racing pans

My point is don't berate an engine you don't know about.