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What is this molding?

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Old May 30, 2015 | 08:33 PM
  #1  
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From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
What is this molding?

What is this molding on the leading edge of the spoiler? I've seen it on a couple of convertibles.
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Old May 31, 2015 | 06:31 PM
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Car: 91 Z28 Coupe
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 2.73
Re: What is this molding?

I have never seen that. I am assuming it may not be an ASC convertible.(which is all I am familiar with).Maybe some of the other conversion companies used it . In the pic I dont even see the third brake, unless it is hidden from the angle.
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Old May 31, 2015 | 09:21 PM
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Car: 89 Iroc Convertible
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 3.27 Posi 9 bolt PBR
Re: What is this molding?

It is a plastic gasket filler piece.I grabbed one off a 91 rs vert that a friend was parting out as mine didn't have it.Im assuming it was used to seal out water from getting under the rear spoiler
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Old May 31, 2015 | 09:32 PM
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From: New Jersey
Car: 91 Z28 Coupe
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 2.73
Re: What is this molding?

Originally Posted by my82roc
It is a plastic gasket filler piece.I grabbed one off a 91 rs vert that a friend was parting out as mine didn't have it.Im assuming it was used to seal out water from getting under the rear spoiler
That is what I thought at first, but it seems that there is a definite seam between the deck lid and spoiler. It could just be from the pic. Out of the 2 91-92 verts I have had, neither have had the gasket sticking out to that point. The gasket is there, but it is neatly tucked underneath the spoiler.
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Old Jun 1, 2015 | 05:36 PM
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Car: 1992 RS Convertible
Engine: 5.0 L 305 TBI
Transmission: 700R4
Re: What is this molding?

I have an 92 and it has this gasket .
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Old Jun 1, 2015 | 10:41 PM
  #6  
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Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: What is this molding?

Does anyone have a picture of it uninstalled?
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Old Jun 2, 2015 | 09:36 AM
  #7  
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Re: What is this molding?

My 1988 and 1989 are both all factory original ASC convertibles and they have the same black weather bead as pictured above. My cars are both white so the black beading is easy to notice on them.
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Old Jun 2, 2015 | 03:25 PM
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Car: 1988 IROC-Z Convertible
Engine: 408 Stroker Turbo, TPIS Mini Ram
Transmission: Magnum t-56
Axle/Gears: Ford 9" 3.55
Re: What is this molding?

yes its a factory piece came with all verts. I took it off mine as I dislike the look but I seldom drive mine. It helps do deflect the water off to the sides as the verts have the trunk that acts like a giant water trap between the 2 rear side spoilers.

If its a daily driver prob good to have this.
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Old Jun 2, 2015 | 03:38 PM
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From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: What is this molding?

Originally Posted by IROCNParts
yes its a factory piece came with all verts. I took it off mine as I dislike the look but I seldom drive mine. It helps do deflect the water off to the sides as the verts have the trunk that acts like a giant water trap between the 2 rear side spoilers.

If its a daily driver prob good to have this.
Got a picture of what it looks like uninstalled?
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Old Jun 3, 2015 | 12:27 PM
  #10  
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From: La Mesilla New Mexico
Car: 1991 Z28 Convertible
Engine: 5.0 TPI
Transmission: 5 Speed
Re: What is this molding?

My 91 has it but it seems a tad dry and it does not extend to the ends of the spoiler so it seems water could get underneath? I would like to find another one or something similar to put in place of it.
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Old Jun 3, 2015 | 03:05 PM
  #11  
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From: Vancouver, BC, Canada
Car: 1988 IROC-Z Convertible
Engine: 408 Stroker Turbo, TPIS Mini Ram
Transmission: Magnum t-56
Axle/Gears: Ford 9" 3.55
Re: What is this molding?

Originally Posted by madness
My 91 has it but it seems a tad dry and it does not extend to the ends of the spoiler so it seems water could get underneath? I would like to find another one or something similar to put in place of it.
ya thats how they are, they dont make it all the way to the ends.
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Old Jun 3, 2015 | 03:06 PM
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From: Vancouver, BC, Canada
Car: 1988 IROC-Z Convertible
Engine: 408 Stroker Turbo, TPIS Mini Ram
Transmission: Magnum t-56
Axle/Gears: Ford 9" 3.55
Re: What is this molding?

Originally Posted by madness
My 91 has it but it seems a tad dry and it does not extend to the ends of the spoiler so it seems water could get underneath? I would like to find another one or something similar to put in place of it.
I have one still on the black vert, Ill try to get it off and take a pic
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Old Jun 3, 2015 | 03:52 PM
  #13  
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From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: What is this molding?

Originally Posted by IROCNParts
I have one still on the black vert, Ill try to get it off and take a pic
Thanks!
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Old Jun 3, 2015 | 04:39 PM
  #14  
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From: La Mesilla New Mexico
Car: 1991 Z28 Convertible
Engine: 5.0 TPI
Transmission: 5 Speed
Re: What is this molding?

Thanks for the info now I don't have to search for one.
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Old Jun 4, 2015 | 05:18 PM
  #15  
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: What is this molding?

My 92 T/A has this. It looks like a solid round bead with a flat section that slides under the spoiler lip. The flat section has a few angled slices cut in it for who knows why..
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Old Jun 5, 2015 | 09:15 AM
  #16  
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From: Doghouse ······································ Car: 1989 Formula 350 Vert Engine: 350 L98 Transmission: 700R4 Axle/Gears: B&W 3.27
Car: 87 Formula T-Top, 87 Formula HT
Engine: 5.1L TPI, 5.0L TPI
Transmission: 700R4, M5
Axle/Gears: Sag 3.73, B&W 3.45
Re: What is this molding?

I wish I could find one for my 89 Formula... Previous owner had removed it, or could not figure out how to reinstall it when they apparently changed the high-mount brake light.
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Old Jun 5, 2015 | 10:50 AM
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: What is this molding?

It looks like miniature lawn/landscaping edging or a 9.
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Old Jun 5, 2015 | 10:53 AM
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: What is this molding?

Originally Posted by okfoz
I wish I could find one for my 89 Formula... Previous owner had removed it, or could not figure out how to reinstall it when they apparently changed the high-mount brake light.
The 89s don't have this piece.
I'll try to get a pic an txt it to you of what it looks like.
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Old Jun 7, 2015 | 01:55 PM
  #19  
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From: Hacienda Heights, CA
Car: 90 RS 'Vert, 88 IROC-Z, 88 Firebird
Engine: 305 ci tbi, 305 ci tpi, 350 ci tpi
Transmission: WC-T5, WC-T5, 700R4
Axle/Gears: 3.45, 3.27, 3.27
Re: What is this molding?

Originally Posted by IROCNParts
ya thats how they are, they dont make it all the way to the ends.
It originally did extend all the way across the trunk lid, but the seal shrinks from UV exposure over time.

Check with a convertible top shop for a replacement. I got some in red vinyl free off a spool from a local top shop. I put it on and decided the red looked OK, so I diverted from my original plan to paint it with black vinyl paint. I don't know what GM or ASC called it, but P-seal is a common name for this type of seal.

The slices on the end are to help it make the slight angle turn. The hard vinyl would not easily turn otherwise without bulging the flat portion.

Lon

Last edited by lonsal; Jun 7, 2015 at 01:59 PM.
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Old Jun 7, 2015 | 03:31 PM
  #20  
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From: New Jersey
Car: 91 Z28 Coupe
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 2.73
Re: What is this molding?

The one 92 vert I had was black (all original), so I probably didn't see it. The second red 91, was a hack job from the PO, and repainted. So it probably trimmed down for the paint job
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Old Jun 8, 2015 | 08:59 AM
  #21  
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From: Doghouse ······································ Car: 1989 Formula 350 Vert Engine: 350 L98 Transmission: 700R4 Axle/Gears: B&W 3.27
Car: 87 Formula T-Top, 87 Formula HT
Engine: 5.1L TPI, 5.0L TPI
Transmission: 700R4, M5
Axle/Gears: Sag 3.73, B&W 3.45
Re: What is this molding?

Originally Posted by TTOP350
The 89s don't have this piece.
I'll try to get a pic an txt it to you of what it looks like.
Correct, on my 89, it was just under the 3rd Brake light housing. Same idea, it was a gap filler. I wanted to duplicate one, but I have no idea what it looks like. If I got an original, I should be able to duplicate it in Black Silicone...

John
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Old Jun 13, 2015 | 02:36 PM
  #22  
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From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: What is this molding?

It's a P-seal. Comes in rolls and is something similar to this. http://www.ebay.co.uk/itm/P-Seal-Str...-/261339216790

I guess we'd need to know the proper size.
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Old Jun 13, 2015 | 02:59 PM
  #23  
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: What is this molding?

Pix from my JY 92 TA vert. (yes its nasty)







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Old Sep 20, 2025 | 01:41 PM
  #24  
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Car: 89 FORMULA 350, 91 Z28 Convertible
Engine: ls1, LB9
Transmission: t56, Auto
Axle/Gears: S60/ 3.73
Re: What is this molding?

anyone find a source other than the open channel seal hawks has?

Last edited by 88 350 tpi formula; Sep 21, 2025 at 04:31 PM.
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