Hello,

I am looking for a Holley manifold for an iron duke. Shipping would be to Calgary, Canada.

Thanks.

If you decide to use that manifold, I believe that it will only accept the larger Holly throttle body. It should enable gaining some horsepower but those two items are difficult to find. The big question is: will the gain justify the investment?

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

I know the upgrade parts are perhaps controversial when V6 swaps are common. I am trying to keep the car looking as stock as possible to the casual viewer, while eking out what power can be had. Hiding a better flowing manifold under the air cleaner helps achieve that. I already have obtained a NOS TBI unit, just need the manifold.

quote Originally posted by Indy-453: I know the upgrade parts are perhaps controversial when V6 swaps are common. I am trying to keep the car looking as stock as possible to the casual viewer, while eking out what power can be had. Hiding a better flowing manifold under the air cleaner helps achieve that. I already have obtained a NOS TBI unit, just need the manifold.

Many other GM automobiles of that era had the Iron Duke engine. If you cannot find the Holley unit, I would investigate which year manifold might flow the best, bolt up and accept the larger Holley throttle body. IMO, the larger Holly throttle body itself is the main power adder and you can always port to smooth out the flow.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

I have an Iron Duke that I just pulled out. It has the Holley throttle body. How does one identify the Holley manifold?

The clearest tell is it has Holley cast into the side of it.

There's some pictures mid way down the thread in this link: https://www.fiero.nl/forum/Forum4/HTML/074980.html

The port for the TBI unit is also bigger on these manifolds.