quote Originally posted by fierosound: Thank you! Just find yourself a BIG (more than I expected) bucket of money.

Well I found some and have purchased a Super Duty block, parts and head. Any advice on building the engine or a good carb to use? I have a double barrel edelbrock intake or I could pick up a set of Weber carbs...I don't know which way to go. Oh, and I want to swap mine to a Getrag 5 speed also.

Sent you a PM.

[This message has been edited by FieroMaster88 (edited 02-22-2013).]

Webers don't fit the engine bay all that well and you'll be sucking hot air.
What this car came with didn't really impress me.

[This message has been edited by fierosound (edited 02-27-2013).]

Updates to the exhaust system.

This Indy originally came with this Hooker 4-tube race header that would not clear the Tilton starter solenoid.
On this style it hits the primary pipe from cylinder #4. Solenoid of stock starter just tucks behind.
This header also hangs below the cradle low enough that you can't install a rear anti-sway bar.



I originally reworked the header to "shorty" style to clear the solenoid and ran without a catalytic convertor.
You can see where the solenoid kicks out here.



The exhaust was damn loud so I need to get a cat. convertor or resonator into the system.
In addition, a Duke header DOESN'T really match the SD4 head's exhaust ports (see below).

The Hooker Tri-Y header style has better scavenging and routes like the stock system for a cat. convertor.
Whodeanie built me a header like this to match my SD4 head. Again, it clears the stock starter, but not the Tilton.

I installed a newer OEM 3800 compact starter which is a tight fit but just clears and wrapped a starter blanket around it.
(not my engine, just using photo to show Tri-Y style header and stock starter solenoid location)

[This message has been edited by fierosound (edited 05-15-2013).]

The SD4 head's exhaust ports are quite different from the stock Iron Duke head.

Header gaskets - there are two listed for the 2.5L (sometimes).

Here's a pic of the exhaust ports on my SD4 aluminum cylinder head GM PN 10038433
Fel-Pro SD4 header gasket PN FPP-1441 is what matches the ports.



Here's a comparison of the difference in exhaust gaskets.
The top one matches my SD4 head's exhaust ports, the lower is a stock Duke gasket.



While it will bolt on, a header built for the Iron Duke head partially blocks the SD4's exhaust port.
You can see how by how much when the SD4 gasket is matched to the Duke gasket underneath.
The already smaller SD4 exhaust port has it's flow blocked by a fair bit.

[This message has been edited by fierosound (edited 05-15-2013).]

Whodeanie (before Fiero business problems started) built me a header with flanges to match the SD4 head and gasket.

Unfortunately, it's was still sized for the Duke engine and had only 2" pipe for the system after the header.
Keep in mind, the SD4 head flows 80% MORE air out of the box than a stock Duke header.
It became apparent that I really needed 2-1/2" pipe as the 2" may have been choking the system.

We reworked the header and it is now 2-1/2" from the Y-pipe from O2 sensor back.
Newly ceramic coated here. Looks kok-eyed, but cat. convertor sits level under the car.





It's hard to see the thing installed in the engine bay.




I haven't had a chance to drive it much. Dealing with replacing the clutch in the GT right now.

[This message has been edited by fierosound (edited 09-01-2023).]

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85 GT 3.4
14.9 @ 90 1.9 60' Old TH125/3.06
Unknown New 4T60/3.42

[This message has been edited by fierosound (edited 05-22-2013).]