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IROC extractor hood

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Old Apr 24, 2022 | 08:11 PM
  #1  
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From: Lake Stevens, WA
Car: 84 Z28, 92 C4 suspension F&R, ABS
Engine: 408 LS2, CNC LS3 heads, Comp Cam
Transmission: Magnum F, RTX clutch, Tick shifter
Axle/Gears: DANA 44, Tru Trac, 3:73 gears
IROC extractor hood

I wanted something extraordinary and unique for my build, so I came up with this.

Bead rolled and shirking the pans

Added extensions to the sides

Fitting and preparing for welding

After about 12 hours of tig welding

It is now ready for primer and block sanding
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Old Apr 24, 2022 | 08:21 PM
  #2  
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Car: 1987 IROC-Z
Engine: 406 on N20 w/ EFI
Transmission: P.B. 700R4
Axle/Gears: 12 bolt w/ 3.91
Re: IROC extractor hood

woah
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Old Apr 24, 2022 | 08:50 PM
  #3  
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Re: IROC extractor hood

Things that make you go hmmm.
I like the idea.
Do you have a cold air intake package as well?
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Old Apr 24, 2022 | 09:12 PM
  #4  
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Car: 1989 IROC-Z
Engine: L98 350 TPI
Transmission: 700R4
Axle/Gears: BW 9 Bolt / 2.77 Posi
Re: IROC extractor hood

I dig it. Any plans for ducting behind the radiator?
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Old Apr 24, 2022 | 09:46 PM
  #5  
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Car: '89 Firebird
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Re: IROC extractor hood

How in the world do you have room for that? My engine gets closer to hood the further forward in engine bay. It even bumps the hood insulation just behind the radiator.
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Old Apr 24, 2022 | 10:16 PM
  #6  
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Re: IROC extractor hood

hmm i never thought about that. i like the idea. i did mine a little different


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Old Apr 24, 2022 | 11:42 PM
  #7  
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From: Lake Stevens, WA
Car: 84 Z28, 92 C4 suspension F&R, ABS
Engine: 408 LS2, CNC LS3 heads, Comp Cam
Transmission: Magnum F, RTX clutch, Tick shifter
Axle/Gears: DANA 44, Tru Trac, 3:73 gears
Re: IROC extractor hood

Originally Posted by skinny z
Things that make you go hmmm.
I like the idea.
Do you have a cold air intake package as well?
Yes, it’s the aluminum box in the RH battery tray.

Originally Posted by Komet
I dig it. Any plans for ducting behind the radiator?
Not at this time, if it were a dedicated track car I would think about it. The ducts align with the dual fans though.

Originally Posted by QwkTrip
How in the world do you have room for that? My engine gets closer to hood the further forward in engine bay. It even bumps the hood insulation just behind the radiator.
It’s a Camaro, if it were a Firebird then this would not work. It would look out of place on a Trans Am anyway. The ducts curve down over the cowl brace and the intake tube in the picture.

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Old Apr 24, 2022 | 11:57 PM
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Re: IROC extractor hood

Originally Posted by soloc4
It’s a Camaro, if it were a Firebird then this would not work. It would look out of place on a Trans Am anyway. The ducts curve down over the cowl brace and the intake tube in the picture.
Yeah, Camaro has the goods in the hood clearance department for sure.
Your engine bay looks so clean and tidy, man! Your fabrication work is always sooooo nice, too!
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Old Apr 25, 2022 | 12:43 AM
  #9  
soloc4's Avatar
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From: Lake Stevens, WA
Car: 84 Z28, 92 C4 suspension F&R, ABS
Engine: 408 LS2, CNC LS3 heads, Comp Cam
Transmission: Magnum F, RTX clutch, Tick shifter
Axle/Gears: DANA 44, Tru Trac, 3:73 gears
Re: IROC extractor hood

Originally Posted by QwkTrip
Yeah, Camaro has the goods in the hood clearance department for sure.
Your engine bay looks so clean and tidy, man! Your fabrication work is always sooooo nice, too!
Thanks, I like to push my limits. This one went way beyond those. I learned a lot with this project. You would think that at my age, I would sit back and retire, but I’m just not ready for that yet.
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Old Apr 25, 2022 | 03:03 PM
  #10  
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Car: 89' Firebird / 87' Formula
Engine: 3.4 / 5.0
Transmission: 700-R4
Axle/Gears: 3.42 / 3.42
Re: IROC extractor hood

Clean!!

What radiator top support are you using? that looks kinda like a third gen one but at the same time looks different?
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Old Apr 25, 2022 | 03:29 PM
  #11  
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From: Lake Stevens, WA
Car: 84 Z28, 92 C4 suspension F&R, ABS
Engine: 408 LS2, CNC LS3 heads, Comp Cam
Transmission: Magnum F, RTX clutch, Tick shifter
Axle/Gears: DANA 44, Tru Trac, 3:73 gears
Re: IROC extractor hood

Originally Posted by 1989karr
Clean!!

What radiator top support are you using? that looks kinda like a third gen one but at the same time looks different?
The one in this picture is the original from the '84. I have since installed a Griffen radiator and had to make a custom aluminum piece that looks very similar to the stock one.
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Old Apr 26, 2022 | 01:27 PM
  #12  
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Car: 89' Firebird / 87' Formula
Engine: 3.4 / 5.0
Transmission: 700-R4
Axle/Gears: 3.42 / 3.42
Re: IROC extractor hood

Originally Posted by soloc4
The one in this picture is the original from the '84. I have since installed a Griffen radiator and had to make a custom aluminum piece that looks very similar to the stock one.

Ahhh nice!

84, no wonder it looks different than the ones Im more used too.

Great build!!!
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Old Apr 27, 2022 | 06:39 PM
  #13  
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From: Lake Stevens, WA
Car: 84 Z28, 92 C4 suspension F&R, ABS
Engine: 408 LS2, CNC LS3 heads, Comp Cam
Transmission: Magnum F, RTX clutch, Tick shifter
Axle/Gears: DANA 44, Tru Trac, 3:73 gears
Re: IROC extractor hood

A successful test fit, it’s as if it was made for the car.



I’m very happy with how well it fits
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Old May 3, 2022 | 07:26 PM
  #14  
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Car: 1988 Trans Am
Engine: L03
Transmission: 700R4
Axle/Gears: 10 Bolt 2.73 Open
Re: IROC extractor hood

So those extractors are falling inside the "triangle" of the strut tower brace with the hood closed?
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Old May 5, 2022 | 05:05 AM
  #15  
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From: Lake Stevens, WA
Car: 84 Z28, 92 C4 suspension F&R, ABS
Engine: 408 LS2, CNC LS3 heads, Comp Cam
Transmission: Magnum F, RTX clutch, Tick shifter
Axle/Gears: DANA 44, Tru Trac, 3:73 gears
Re: IROC extractor hood

Originally Posted by DynoDave43
So those extractors are falling inside the "triangle" of the strut tower brace with the hood closed?
No, they are forward of the brace. There is a 3 1/2" gap between the forward edge of the intake tube and the aft edge of the radiator shroud and this is where the duct openings are. They also happen to align with the cooling fans. on the radiator. I should take a picture of this with the hood closed to illustrate it.
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Old May 11, 2022 | 06:15 PM
  #16  
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Car: 1988 Trans Am
Engine: L03
Transmission: 700R4
Axle/Gears: 10 Bolt 2.73 Open
Re: IROC extractor hood

That makes more sense. It was just hard to visualize. With the radiator hose/pipe running through, I was having a hard time imagining it clearing.
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Old Oct 9, 2022 | 09:27 PM
  #17  
soloc4's Avatar
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From: Lake Stevens, WA
Car: 84 Z28, 92 C4 suspension F&R, ABS
Engine: 408 LS2, CNC LS3 heads, Comp Cam
Transmission: Magnum F, RTX clutch, Tick shifter
Axle/Gears: DANA 44, Tru Trac, 3:73 gears
Re: IROC extractor hood



I’ve gotten a few things in epoxy primer
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Old Oct 11, 2022 | 11:20 AM
  #18  
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Car: 1989 Camaro RS
Engine: LH6
Transmission: T56
Axle/Gears: 3.42 Auburn Posi
Re: IROC extractor hood

Have you thought about putting those IROC louvers that are cut out over top? Give it a factory look but some real function.
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Old Oct 11, 2022 | 05:11 PM
  #19  
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From: Lake Stevens, WA
Car: 84 Z28, 92 C4 suspension F&R, ABS
Engine: 408 LS2, CNC LS3 heads, Comp Cam
Transmission: Magnum F, RTX clutch, Tick shifter
Axle/Gears: DANA 44, Tru Trac, 3:73 gears
Re: IROC extractor hood

Originally Posted by RubberDucky
Have you thought about putting those IROC louvers that are cut out over top? Give it a factory look but some real function.
No! I could have put TrackSpec grills on this like everyone else has done and it would have been a lot easier. As far as opening up the IROC inserts, it’s been done by a good friend of mine and we will be side by side at some shows in the future.

BajaDaze IROC hood

I have made matching grill inserts for the front bumper and the hood to complete the look.

Matching stainless steel grills

The final product will be unique look for a one of a kind build.
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Old Oct 12, 2022 | 06:05 PM
  #20  
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Car: 91 RS/ 99 T/A/ 72 Vette/ 02 Z28
Engine: LSx/ Dart400
Transmission: M6/ M6/ TH400/ 4L60E
Axle/Gears: 4.10's / 3.08/ 2.73
Re: IROC extractor hood

Looking fantastic!
A++
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Old Oct 12, 2022 | 11:31 PM
  #21  
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Re: IROC extractor hood

This is really a fantastic take on the Iroc hood
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Old Apr 5, 2023 | 07:10 PM
  #22  
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Car: 84 Z28, 92 C4 suspension F&R, ABS
Engine: 408 LS2, CNC LS3 heads, Comp Cam
Transmission: Magnum F, RTX clutch, Tick shifter
Axle/Gears: DANA 44, Tru Trac, 3:73 gears
Re: IROC extractor hood


Final update to this thread. The grills have been installed and the hood is ready to be installed on the car.

Last edited by soloc4; Apr 5, 2023 at 07:14 PM.
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Old Apr 5, 2023 | 07:26 PM
  #23  
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Re: IROC extractor hood

Well thought out.
Well executed.
I'd be keen to see something with the hood up. It's been a while.
What's the cold air intake comprised of again? Reminds me of some Corvette details I saw years back with the CAI over the rad (not unlike the TPI setup) and the hood designed to allow the radiator to vent through the cut outs in the hood. Much like your design. (I apologize if I covering old ground).

EDIT: I see your CAI looks to be off to one side. Is that correct?
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Old Apr 6, 2023 | 10:22 PM
  #24  
soloc4's Avatar
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From: Lake Stevens, WA
Car: 84 Z28, 92 C4 suspension F&R, ABS
Engine: 408 LS2, CNC LS3 heads, Comp Cam
Transmission: Magnum F, RTX clutch, Tick shifter
Axle/Gears: DANA 44, Tru Trac, 3:73 gears
Re: IROC extractor hood

Originally Posted by skinny z
Well thought out.
Well executed.
I'd be keen to see something with the hood up. It's been a while.
What's the cold air intake comprised of again? Reminds me of some Corvette details I saw years back with the CAI over the rad (not unlike the TPI setup) and the hood designed to allow the radiator to vent through the cut outs in the hood. Much like your design. (I apologize if I covering old ground).

EDIT: I see your CAI looks to be off to one side. Is that correct?
Yes, the CAI is on the right side battery tray. The air comes in from the enlarged side opening. The ABS system is in the left side battery tray, so I went with a single 4” intake tube. The inspiration for the hood came from the GT40, but not intended to be a full race aero. The ZL1 hood is not fully ducted and it provides additional downforce at high speeds, but I’m not sure that will ever be tested on this car.
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Old Apr 12, 2023 | 10:35 PM
  #25  
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Car: 84 Z28, 92 C4 suspension F&R, ABS
Engine: 408 LS2, CNC LS3 heads, Comp Cam
Transmission: Magnum F, RTX clutch, Tick shifter
Axle/Gears: DANA 44, Tru Trac, 3:73 gears
Re: IROC extractor hood


Here is a POV of the grills from the drivers seat.
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Old Aug 4, 2023 | 10:32 AM
  #26  
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From: Lake Stevens, WA
Car: 84 Z28, 92 C4 suspension F&R, ABS
Engine: 408 LS2, CNC LS3 heads, Comp Cam
Transmission: Magnum F, RTX clutch, Tick shifter
Axle/Gears: DANA 44, Tru Trac, 3:73 gears
Re: IROC extractor hood



A couple of pictures with the hood on the car
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Old Aug 10, 2023 | 06:14 PM
  #27  
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Car: 91/89/85/82 Z28s, 88 TA, 88/88 SC
Engine: SBC and LS variations
Re: IROC extractor hood

Fantastic!

Originally Posted by soloc4


A couple of pictures with the hood on the car
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Old Jul 17, 2024 | 11:17 AM
  #28  
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Re: IROC extractor hood

Great job. These turned out phenominal.
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