Hi Folks.
Long story short - I'm a car dealer that has aquired
(What I think is) an 87 IROC Z-28.
It's a little too rough
to retail it on our lot so we're Ebaying it.
Now we sell lots of cars but we aren't IROC
"geeks" <sorry don't mean that in a bad way<
I just mean we don't know every detail about these
cars. My question is how do I tell it's actually an IROC?
This car is a 5.0 305 V8 Automatic TBI. Has both the
Z-28 and IROC emblems.
I've had several people tell me that there were no
IROC's made with TBI so they are asking if the engine
has been swapped (Which I have no history on this car)
or if it is a fake IROC.
The VIN is 1G1FP21H3HL109450 -
I've done a little research in the web and found the VIN decoder. The engine code is LG4 and it
also says 4V induction (Not TBI or TPI)
Is there something on the car that would specify it's an IROC other than the decals? What makes it an IROC?
I only started this auction at $800.00 as I thought I was just putting an old classic on - but I've has SOOOO many emails
on this I thought I'd better clarify if I could. I just don't want to mislead anybody.
Any help from you folks is appreciated.

 

see if you can find the SPID sticker...it is usually in the console compartment or in the rear storage box. Check it to make sure it matches the VIN of the car and then look for the RPO codes Z28 and B4Z. Or alternately you could just input all the RPO's here and see what you come up with.

IROC's came with a whole bunch of stuff...wonderbar, better sways, shocks/struts, springs....etc. Theres a list around here somewhere.

 

Your VIN indicates an LG4, as you already know. The tbi motor was not available until 1988. Are you sure that it's got tbi injection? I can't imagine anybody being crazy enough to go through all that work to put tbi on.

But anyway... I don't see anything out of the ordinary except for the tbi and the wheels. In 87, the IROC-Z had Z28 badges on the ground effects and rear bumper, as well as on the dash board. You could identify the IROC positively by the RPO code "B4Z" on the RPO tag (SPID) which is attached to the underside of the center console lid.

The IROCs had everything a Z28 had, plus the 16" wheels (the wheels on your car came from a 91 or 92 though), stiffer springs, Billstein shocks/struts, same-color ground effects, different steering box and the wonderbar. The Wonderbar is a good thing to check for. It doesn't guarantee that it's an authentic IROC, but for those few people that actually know about it, it's doubtful that they'd spend the money on a fake IROC unless it was a damned nice one. The wonderbar is a support bar that ties the front of the subframe together. It's mounted directly in front of the front sway bar, right behind the radiator support.

 

it looks like this

 

Thanks for your help everybody!
You are correct in questioning the TBI. It does not have it.
When I checked the specs it says "Induction 4V" which if I'm reading it right, just means 4 barrel carb. So no TPI or TBI injection.
I did check the codes like you said and it is an IROC Z-28.

I just set up and run the auctions for the dealership and obviously don't know near enough about IROCs. ( I'm not worthy!!!)
I've never had so many auction emails about one piece of information! Hopefully I've got this figured out!
Thanks again! Carrie

 

To prove to people walking up to see the car, the IROC was the only car available in 87 with the 16" wheels. If the placard is still on the drivers door, it should state the tire size of 245 - 50 16. This will prove to the common folk the IROC issue. Good Luck!

 

it would be easy to swap in a new console lid, or glove box lid, with one from an IROC.....

I don't remember if they had the VINs on the RPO sheets or not.....just something to think about

 

Why does everyone say the SPI label is on the lid? My label is in the glove box on the side viewable from the drivers seat. I have never seen them on the bottom of the lid.

 

I have never seen them on the Lid either. & As for the Vin on them YES they have the vin # on the lable as well that way you know if it belongs to your car or not.

 

yeah the VIN is on the RPO tag, it's the first thing you check. And all the ones I've seen are on the inner side of the console compartment, visible from the drivers side.

 

They were originally on the lid, then they moved to the side of the console, and then to the storage compartment in the rear.

 

The VIN on the tag matched the car VIN.
Thanks again everybody - I assured those asking for proof
and had a successfull auction.

 

Congratulations on the successfull auction, Carrie, and glad some knowelageable(sp?) thirdgenners could help out, that's one of the reasons we're here. Some of these guys really know their stuff.