HELLO EVERYBODY,I AM IN THE PROCESS OF BUYING MY FIRST IROC(I THINK) THIS WEEKEND AND IM PUMPED.THERE IS ONLY ONE PROBLEM,THE CAR DOESNT HAVE A RPO DECAL IN CONSOLE.I HAVE BEEN RESEARCHING MY *** OFF TO MAKE SURE IM BUYING AN IROC.HERE IS WHAT I KNOW ABOUT CAR JUST FROM VIN NUMBER, 8TH DIGIT IS F(LB9)10TH DIGIT IS H(1987).THE CAR HAS A LB9 WITH A 5 SPEED TRANS,4 WHEEL DISC,TTOP,HAS TUNED PORT BAGDE ON REAR,FRONT FOG LIGHTS,THIRD BRAKE LIGHT ON SPOILER,CENTER BOLT VALVE COVERS,THE IROC Z DECALS IS TOWARD FRONT OF DOOR,RED INTERIOR,THE SPEEDOMETER READS 145,THE TACH REDLINES AT 5500.IS THIS A REAL IROC Z ????????HELP

 

First, turn off your caps lock key. It is the equivalent to yelling when you post on a message board. Second, do a search. This question has been asked over and over and over again.

https://www.thirdgen.org/forums/hist...-car-iroc.html

 

Thanks for reply,sorry for the caps.i have searched and this what i always come up with.........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.

doesnt really tell me to much except that i need the rpo code!!!!

 

Check the back "glove box". For some reason my RPO tag is located there.

 

Check the vin for "8." Also check the door jamb for tire size. An IROC would have 16" wheels.

JamesC

 

They moved it to the rear glove box sometime in 91.

Yes, and that is basically all anyone will be able to tell you.

 

Well that makes sense then, cause I have a 92.

 

thanks calamitas,the funky this is that there is a rpo tag in the rear glove box but it isnt the same vin as the one on the dash,im thinking the one on the dash is the correct vin.mr james the car has a 305 so it wouldnt have the 8 in the vin,but i will check for 16 inch rims in door jam.thanks

 

lb9 with a 5 speed and disc brakes with a 9 bolt rear,I THINK you could only get this combo on an iroc z in 1987??

 

I would surmise that some of, if not all of the interior was swapped to a new one then? Might want to check that out if you're looking for an all original car.

 

As James stated, your best bet is to check the door stickers and look for 245/50-16 as the tire size. The windshield VIN should always be the "correct" VIN. Swapping parts with a VIN sticker is fully legal, but swapping the VIN tag of a car is a federal offense, so it doesn't happen often. The decal should not be in the rear of the car in 1987. It should be in the console. I agree with the statement that the entire interior might have been swapped. The 4 wheel disc brake setup was not available on the Z28, only the IROC-Z in 1987.

 

thanks scott,thats what i thought but wasnt sure.cant wait to get it and start driving and fixing up that bad boy.

 

Hello MORREALE5!!

Take the VIN and run it through www.compnine.com they have a VIN breakdown app that will give you the RPO options on the VIN in question!!

Check it out first!!

I have a Blue Z-28 with all the IROC-Z parts sans the Fog Lights, Wonderbar, Borg-Warner 9 bolt, 16 inch wheels, engine oil cooler, and the proper decals!! However, these parts are available, and have been known to be swapped to make an unsuspecting buyer think that he was buying an IROC-Z, when all he was really getting was a Z-28!!

Go into the deal fully armed!!

 

Compnine is only good for 90-92 and Canadian cars.

 

Hello AmorgetRS!!

I didn't know that!!



Sure don't hurt to try though, on the off chance that something comes up!!

 

thanks mr dan,dumb question what is a wonderbar?is it common to be on an iroc z and should i look for it?i think im gonna get the car,from everything i have researched it points towards being an iroc so im gonna go with my gut.

 

The wonderbar is an IROC/91-92 Z28 thing. It was meant to b race the steering box against the other front frame rail to keep the area around the steering box from cracking with the larger 16 inch wheels and tires.

It looks kinda like a second sway bar.



Look above the curved sway bar and you'll see the straight wonderbar. This is a factory GM wonderbar.

 

Hello InfernalVortex!!

Thanks for the picture!!! Speaks a 1000 words!!!



Where's the engine, you didn't take it out just to show MORREALE5 the wonderbar did you!!

 

Hello MORREALE5!!

Pictures, you need to post pictures once you get this car!!

Short answer to the wonderbar question, yes, see InfernalVortex's post/picture about the wonderbar!!

 

real IROC or not, a lb9 5 speed 4wheel disc car is one of the most desirable setups, i would go for it anyway. hardtop would be better in my book

 

Hello //<86TA>\\!!

I have one of those most desirable "real" IROC set ups, and it's a hardtop too!!!

No it's real!!

 

AWESOME!thanks to everybody for the help and info,mr dan pictures on the way.