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Is my Car an IROC?

Old 01-28-2011, 09:56 PM
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Is my Car an IROC?

If you just bought a new 1985-1990 Camaro, and you aren't sure if it's an IROC or not, here's how you can tell. This document will only focus on determining if your car is an IROC, or not. It will not go into greater detail to determine exactly which model you have (Berlinetta, Sport Coupe, RS, Z28, etc.) beyond that. This post is mainly just to determine if you have the king of the hill IROC-Z or not. If not, you will need to use the site's extensive tech data to determine exactly which model you have, plain Z28 or otherwise. The tech data is available on the homepage here, in the left sidebar. Now, on to determining if you have an IROC or something else.

The best way to tell what your car is is by looking at the RPO codes, listed in the center console. These are de facto truths, as long as the VIN on the SPID (Service Parts Identification) matches the VIN on your cowl. However, in the event your car's console has been replaced and your SPID is long gone, it is possible in some cases to determine if your car is an IROC or not by the VIN; the VIN tells you what engine the car came with originally, not what trim model the car came with. However, as certain engines were only offered on IROCs in certain years, you can deduce that you have an IROC based on the VIN in some instances. Data is broken down by year below. In each year, the letters for each engine option refer to the eight digit of your VIN--that is the engine code. If at all possible, use the RPO codes to determine if your car is an IROC, rather than the VIN. Only look to the VIN for guidance if your SPID is missing.

If your car's model year is:

1985:

1985 IROCs used two different RPO codes--"Z28", and "B4Z". Plain Z28s will have just "Z28" in the RPO codes. IROCs will have both "Z28" and "B4Z", because "B4Z" is the RPO code for the IROC package, which was added on to the "Z28" package. For 1985, No "B4Z"=no IROC.

However, if your SPID is missing, the eighth digit of the VIN may be able to tell you what you have:

IROC Engines:

F (LB9)
G (L69)
H (LG4)

--In 1985, if your VIN shows a "G" in the 8th position, you have an IROC, because the IROC was the only model this engine was available in.

--In 1985, if your VIN shows either "F" or "H", the VIN tells you nothing about the car's status as an IROC, because these engines were also used in other models. You will need the RPO codes from the SPID.

--The RPO code to look for in 1985 is "B4Z". For this year, No "B4Z"=No IROC.

1986:

1986 IROCs used two different RPO codes--"Z28", and "B4Z". Plain Z28s will have just "Z28" in the RPO codes. IROCs will have both "Z28" and "B4Z", because "B4Z" is the RPO code for the IROC package, which was added on to the "Z28" package. For 1986, No "B4Z"=no IROC.

Engine options for 1986 were as follows:

IROC Engines:

F (LB9)
G (L69)
H (LG4)

--In 1986, the VIN tells you nothing about the car's status as an IROC, because all of the engine options were available on models other than just the IROC. You will need the RPO codes from the SPID.

--The RPO code to look for in 1986 is "B4Z". For this year, No "B4Z"=No IROC.

1987:

1987 IROCs used two different RPO codes--"Z28", and "B4Z". Plain Z28s will have just "Z28" in the RPO codes. IROCs will have both "Z28" and "B4Z", because "B4Z" is the RPO code for the IROC package, which was added on to the "Z28" package. For 1987, No "B4Z"=no IROC.

However, if your SPID is missing, the eighth digit of the VIN may be able to tell you what you have:

IROC Engines:

F (LB9)
H (LG4)
8 (L98)

--In 1987, if your VIN shows an "8" in the 8th position, you have an IROC, because the IROC was the only model this engine was available in.

--In 1987, if your VIN shows either "F" or "H", the VIN tells you nothing about the car's status as an IROC, because these engines were also used in other models. You will need the RPO codes from the SPID.

--The RPO code to look for in 1987 is "B4Z". For this year, No "B4Z"=No IROC.

1988:

In 1988, you could not purchase a Z28 that was not also an IROC. All Z28s were IROCs by default in 1988, so GM no longer used both "Z28" and "B4Z" RPO codes. Instead, they dropped "B4Z" and just used "Z28" on the SPID. In other words, for 1988, No "Z28" (RPO on the SPID)=No IROC.

However, if your SPID is missing, the eighth digit of the VIN may be able to tell you what you have:

IROC Engines:

E (LO3)
F (LB9)
8 (L98)

--In 1988, if your VIN shows an "E" in the eighth position, the VIN tells you nothing about the car's status as an IROC, because this engine was available in both the IROC and the Sport Coupe. You will need the RPO codes from the SPID.

--In 1988, if your VIN shows either an "F" or an "8" in the eighth position, you have an IROC, because the IROC was the only model these engines were available in.

--The RPO code to look for in 1988 is "Z28". For this year, No "Z28"=No IROC.

1989:

In 1989, you could not purchase a Z28 that was not also an IROC. All Z28s were IROCs by default in 1989, so GM no longer used both "Z28" and "B4Z" RPO codes. Instead, they dropped "B4Z" and just used "Z28" on the SPID. In other words, for 1989, No "Z28" (RPO on the SPID)=No IROC.

However, if your SPID is missing, the eighth digit of the VIN may be able to tell you what you have:

IROC Engines:

E (LO3)
F (LB9)
8 (L98)

--In 1989, if your VIN shows an "E" in the eighth position, the VIN tells you nothing about the car's status as an IROC, because this engine was available in both the IROC and the RS. You will need the RPO codes from the SPID.

--In 1989, if your VIN shows either an "F" or an "8" in the eighth position, you have an IROC, because the IROC was the only model these engines were available in.

--The RPO code to look for in 1989 is "Z28". For this year, No "Z28"=No IROC.

1990:

In 1990, you could not purchase a Z28 that was not also an IROC. All Z28s were IROCs by default in 1990, so GM no longer used both "Z28" and "B4Z" RPO codes. Instead, they dropped "B4Z" and just used "Z28" on the SPID. In other words, for 1990, No "Z28" (RPO on the SPID)=No IROC.

However, if your SPID is missing, the eighth digit of the VIN may be able to tell you what you have:

IROC Engines:

F (LB9)
8 (L98)

--In 1990, if your VIN shows either an "F" or an "8" in the eighth position, you have an IROC, because the IROC was the only model these engines were available in.

--The RPO code to look for in 1990 is "Z28". For this year, No "Z28"=No IROC.

Quick Summary:

1) 1985-1987 IROCs will have "B4Z" on the SPID. For these years, no "B4Z"=no IROC. If you just have "Z28" on the SPID, it's a plain Z28, and not an IROC.

2) 1988-1990 IROCs will have only "Z28" on the SPID. For these years, no "Z28" (RPO on the SPID)=no IROC. "B4Z" was not an RPO code used in these years.


3) An engine code of "8" for any car, 1987-1990, means the car is an IROC.

3) An engine code of "G" in 1985 means the car is an IROC.

4) For 1986, you must use the SPID to determine if you have an IROC. The VIN can't help you at all.

5) For 1987, an engine code of "F" or "H" tells you nothing. You need the SPID to determine if you have an IROC.

6) For 1988-1990, an engine code of "F" or "8" means you have an IROC. If you have an engine code of "E" (1988-1989 only), you need the SPID to determine if it's an IROC.
Old 01-29-2011, 03:07 PM
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Re: Is my Car an IROC?

This should be a sticky. Too many people keep asking these same questions over and over again.
Old 01-30-2011, 07:14 AM
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Re: Is my Car an IROC?

Thanks for taking action, Puma.

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Old 01-30-2011, 08:13 AM
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Re: Is my Car an IROC?

Originally Posted by '87IROCZOWNER69
This should be a sticky. Too many people keep asking these same questions over and over again.
all information is readily available with a simple search. there is no way to make it any easier and guys will still think they have a factory 84 350tpi 5 speed Iroc.
Old 01-30-2011, 11:49 AM
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Re: Is my Car an IROC?

Originally Posted by sloick
all information is readily available with a simple search. there is no way to make it any easier and guys will still think they have a factory 84 350tpi 5 speed Iroc.
I have that exact car only mine is a factory convertible all stock too
Old 01-31-2011, 08:28 AM
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Re: Is my Car an IROC?

Originally Posted by JamesC
Thanks for taking action, Puma.

JamesC
No problem, it needed to be done--whether or not it becomes a sticky.
Old 11-09-2013, 06:05 AM
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Re: Is my Car an IROC?

Correct me if I am wrong but you can determine if your 86 or 87 camaro is an IROC just by checking this sticker on the driver's side door. If the wheel size is 16" you have an IROC. I don't recall any other camaro that came with a 16" wheel other than the IROC. The 85-87 Z28 and the 87 RS came with 15" wheels. And the 15" IROC wheels weren't available in 85-87. Could you order a regular Z28 with IROC wheels back then?
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Old 11-10-2013, 11:15 PM
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Re: Is my Car an IROC?

no they'd get the z28 5 spokes just like 82-84. so yeah that'd be the easiest way assuming the car has the original door and said sticker is still there. mine is still there, however non legible
Old 03-13-2017, 08:42 AM
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Re: Is my Car an IROC?

Hey guys I have been searching through thirdgen.org for months now since I got my car at the end of last summer. Barely drove it and parked it. I'm from Canada and the appraiser told me I had an extremely rare iroc. I already knew what I was buying was a (low production #''s car) making it rare simply because it was hard to find. I have verified my Vin with my mechanic and all the online decoders. I found some info on here shortly after I got the car and can't seem to find it again. So according to the appraiser. There was a tremendously small amount of these made. The items he pointed out.

1987 Camaro Iroc-Z
- Hardtop (apparently 87 is the only year t-top 5.7 was not an option)
- 5.7 L98 (first year of the corvette engine in a camaro) iroc B4Z code on bill on sales.
- Only year the g92 package was standard with the 5.7 so this car has the full package G92 not bits and pieces.
- Super rare for a Canadian car (says we would of only got 10% of what the states got). (240 km/h guages) in this condition (89k) original paint, all original 100%. Only a flow master 40 series
- according to him it's super super rare to have factory bucket style high seats, single peice, cloth. (This is the part I can't find any any info on??)

So if anyone can send me some links on thirdgen.org to the rarity of cars with these seats or just these facts in general. Is this car in fact super rare or is it just not often found in fantastic shape.


Thanks so much guys!
Jay.
Attached Thumbnails Is my Car an IROC?-20160817_231759.jpeg   Is my Car an IROC?-20160817_231703.jpg   Is my Car an IROC?-20160817_230632.jpeg   Is my Car an IROC?-0b52a832-1b62-4207-91f5   Is my Car an IROC?-60eb6d0d-251f-4e55-bc2a  

Is my Car an IROC?-8e592bd8-f9ea-456a-b81c  
Old 03-13-2017, 10:28 AM
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Re: Is my Car an IROC?

Looks like a nice car, "rare" is a real stretch. "Super rare" is nonsensical.

You never had to have T-tops with the 350, but it was available in 1987.

G92 doesn't really apply to the 87 Iroc L98 cars because they don't carry the RPO. They didn't need to because the performance axle ratio was required, and standard with the 350. Further there really isn't a "full package G92". G92 is performance axle ratio, period. When G92 is ordered on a later 305 or 350 that doesn't automatically require other performance options, it frequently triggers those options. There were several years that the L98 required all the options associated with G92.

Not quite all original aside from the exhaust, those wheels are 88-90.

The cloth high back seats were an option. Someone spent about $30 to upgrade from vinyl, but didn't want to spend $300 to get the custom cloth. While not terribly common or popular, even if it was only .5% of total production, it's not the kind of option that adds thousands of dollars to the car's value.

It's a nice Iroc, enjoy it, but it's not the belle of the Barrett-Jackson ball. "Rare" doesn't really apply here. There's an entire sticky thread on the history board explaining as much.
Old 03-13-2017, 02:50 PM
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Re: Is my Car an IROC?

Thanks for the reply drew, 1 thing that I did notice when I bought the car was the 88-90 rims. And I asked why these were on the car. I'm the 3rd owner and the 2nd owner said when he bought the car the 88-90 rims where already on it. He did include a binder full of documentation on the vehicle and I found some pictures and paper work on the car. They were never upgraded from the dealer or anything like that. But the day the guy got the car it came with these rims. My mechanic also told me that because the new cars were coming out in 1988 near the end of the production of 87 if they starting running out of stock they started putting on the style rims.

This could sound all bogus to you guys with more knowledge, but it's started to make sense to me when I seen the original pictures of the car the day the 1st owner picked it up. The decal location and strip order is correct to 1987 tho.

Also I'm happy this guy upgraded the seats because they feel really nice with the small bolsters on the side.

Again thanks for the info this was my first post, looking forward to.learning my way around the site.

Last edited by Jaybriz; 03-13-2017 at 02:53 PM.
Old 03-18-2017, 07:55 AM
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Re: Is my Car an IROC?

Yeah so I don't know how to go about finding out more information out the car. How many were made like this. If the dealer did put the 88 wheels. I asked my mechanic again and he said it's common. There are a few things I've noticed nows. But I have pictures from the dealer on the first day the original owner got it lol.

The Vin checks out. I researched the **** out of it before I bought the car.

- Main iroc-z decal in the 1987 location
- Black and silver striping in the 1988 orientation
- On the side skirt it says iroc-z which is 1988 (87 is Z28?)
- Rims are 16" 1988

I want to see if i can contact the original owner and ask him some questions.

Thanks if anyone can chime in.

Last edited by Jaybriz; 03-18-2017 at 01:38 PM.
Old 03-18-2017, 08:12 AM
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Re: Is my Car an IROC?

What is a more likely scenario regarding your wheels is that they were swapped when the car went through it's first set of tires. The Gatorbacks wore at an alarming rate and with more than 55,000 miles on your car that is likely the third set of tires on it.

When these cars were new they were the #1 stolen car out there and new wheels & tire sets were easily found in the right neighborhoods for $400 or less - less than the cost of a new set of tires. I bought a set when my car was still a year old and stuck my old set in the garage - mine had the same rims as my car had new, looks like your owner decided to update.

The stories of line workers substituting one year to another parts on cars are just that - stories. The Norwood plant closed after 1987 production and Van Nuys went through a shut down period where the new parts were shuttled in & old ones taken out. The likelihood that those rims were installed on that car at the factory are zero.

Cool car BTW & welcome!
Old 03-18-2017, 01:49 PM
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Re: Is my Car an IROC?

Originally Posted by PurelyPMD
What is a more likely scenario regarding your wheels is that they were swapped when the car went through it's first set of tires. The Gatorbacks wore at an alarming rate and with more than 55,000 miles on your car that is likely the third set of tires on it.

When these cars were new they were the #1 stolen car out there and new wheels & tire sets were easily found in the right neighborhoods for $400 or less - less than the cost of a new set of tires. I bought a set when my car was still a year old and stuck my old set in the garage - mine had the same rims as my car had new, looks like your owner decided to update.

The stories of line workers substituting one year to another parts on cars are just that - stories. The Norwood plant closed after 1987 production and Van Nuys went through a shut down period where the new parts were shuttled in & old ones taken out. The likelihood that those rims were installed on that car at the factory are zero.

Cool car BTW & welcome!

I am currently trying to contact the original owner because I have the original bill of sale and his name and address. I understand the odds of him living there after 30 years are slim. I do have his full name. I just want to ask the guy a few questions don't want to harass him or anything. I know by the vin that its not a 305 that was made to look like the 5.7L because everything checks out.

Only issue I have that is screwing with my head because I have always been the type to think the way you guys are. These things are so rare that they would happen at the factory. But I have pictures of the car the first day the guy bought the car, he brought it home and took pictures and starting to make a portfolio of the car. that binder with bill of sales and all the original tags and documentation from the dealer were in there. This guy cared enough to do that. I cant see him changing these parts for parts that were not of the year (anything is possible). Rims Maybe....on the bill of sales he traded in a 86 Z28 and bought the 87 iroc 5.7, So obviously this guy regret not buying the iroc in 86 and went back and then got the (best package they had that year). So to say he went out after that and got the new 88 rims because he always wanted the newest stuff is reasonable to think.

But where I'm just stuck right now is the striping on the car is from 88. Why would he change that? Again possible. But The side skirts also say IrocZ. And there suppose to said Z28 correct me if I'm wrong? If he did try and do a 88 Conversion he did a hell of a job and got all the parts spot on lol. The Large Iroc-Z decal on the door tho is in the 1987 position. Then another question, How would have he known the same day he bought the car that the Stripes and z28 logo would change?

Thanks for answering my questions up until now guys, good community here I'm excited to be a part of.

Last edited by Jaybriz; 03-18-2017 at 01:54 PM.
Old 03-18-2017, 04:20 PM
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Re: Is my Car an IROC?

Whats the VIN - we can tell you if it happened to be a late build car.
Old 03-29-2017, 11:41 AM
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Re: Is my Car an IROC?

Originally Posted by PurelyPMD
Whats the VIN - we can tell you if it happened to be a late build car.
Hey thanks! I assume the last digits are the #'s your looking for. 143742

I've been trying to contact the owner. Called 5 or 6 numbers matching the name. No luck yet. Not even sure if he's alive. The car was sold in 1993 to the owner I bought the car from. That's 24 years ago. The guy could have been 50 or 60. Did a name search and I'm trying to call the names closes to where I think he might have moved from the address on the bill of sale.

anyways thanks guys.

Jay.
Old 03-29-2017, 05:26 PM
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Re: Is my Car an IROC?

If your car was built in the Norwood plant it was built in February or March going by VIN sequence - it's 7,000 earlier than mine which was built in early April.

The end of the year build with parts from the next model year story isn't holding water.
Old 03-29-2017, 05:34 PM
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Re: Is my Car an IROC?

Originally Posted by PurelyPMD
If your car was built in the Norwood plant it was built in February or March going by VIN sequence - it's 7,000 earlier than mine which was built in early April.

The end of the year build with parts from the next model year story isn't holding water.

Yea pretty sure mine was norwood. I have to go check after work again. I really want to speak to this guy lol. The rims and the badges on the side skirts are easy. But the silver and black strips are so straight and clean. They look factory. Looks like he might have done a few cosmetics on the car. I have to continue to find out more about the car.


Thanks guys.
Old 05-20-2017, 10:07 AM
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Re: Is my Car an IROC?

The silver and black stripes would have been so easy to install, the fact they are on correctly isn't proof they are factory.
I retired as a GM fixed ops director and over the years, I've helped do things to new cars for customers that 25 or so years from now are going to blow people's minds. We've installed 1LE suspension packages on base model 5th gen cars, Z/28 body parts on regular SS's... many many many times. My 2015 Camaro that I bought right before I retired is a mix of original GM parts that would confuse the sh*t out of anyone who gets their hands on that car years from now. Nothing about it will make sense.
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