I am going to say I have been a member here for years and never really posted but have learned a lot and in particular like this section of the forum. A good friend of mine is an avid third gen hoarder and I just found the car he picked up yesterday a little odd. It's a 1987 Iroc but its option list is kind of weird. When I first saw it I thought maybe it was a Players Choice Series car but it is lacking the A4U RPO. That and once he got the car it is also a factory T top car.

Why I initially I thought that was this car is an LB9 5 liter, 5 speed with the GM3 3.45 gear 9 bolt, KC4 oil cooler and J65 rear discs but the G92 RPO code dictating the performance axle ratio option is not present so what what happened there? Interior wise it's also odd as it only has power windows... no door locks, no a/c, nothing. I will attach a picture of the SPID.

I have seen other cars on this forum like this posted but just found it odd... and no resolution in the threads I have seen.


Thanks!

 

It is a Canadian export thing? Car shows Z49. It's known that has created a few "different" cases.

Compnine shows 546 like this car (IROC-Z28, LB9, 5-Speed, 3.45, KC4 and J65) but none of those 546 in their database show the G92 code.

 

The car is from British Columbia. Now if that makes it all on its own... well that would not surprise me.

 

To add, it appears for those 1987 Canadian IROC-Z28s, G92 only appeared with the 305/Auto transmission and 3.23 (showing 38 of them). None of the manuals show G92 but all of them did get 3.45s

So in that regard, it wasn't optional on the manual but included? Maybe that's why no G92 code?

 

I don't know man... it's why I am asking lol. So what cam is in this thing then? Seems no clear cut answers on LB9's for 1987 either haha. I mean it doesn't really matter but it would be interesting to know. I am assuming it's not the so called "Peanut" cam being a 5 speed but it also just has the single cat exhaust( or did.. it's headers and full aftermarket exhaust now) . From some of what I see it should be the 202/207 @ .05 duration .404/.415 lift 114.5 lsa. But being this weird one off disaster maybe it has the peanut cam lol.

 

Compnine goes to 1987 now, JT?

 

It's because the car is a Z49 (Canada export). Compnine has records of Z49 cars in their database that date further back than non-Z49 cars.

 

Yup. It's a Canadian thing as said. I have a monthly paid membership on old compnine and it works great up here lol.

This car is such a heap lol. Someone swapped in an open 3.08 10 bolt, it's full of bondo from collision damage... and electrically it's a disaster. All on a car showing 105000 original kilometers lol.

Update. Ran a carfax. Well the car was scrapped and branded salvage in 1992. Then issued rebuilt status in 1997. Last registered in 2002. Being a scrap pile that was rebuilt requiring an out of province.. well it can donate parts to the guys 89 Iroc... which is also an oddball base engine TBI car lol... however the 89 is a loaded hardtop which is a lot nicer!

 

The LB9 5 speed came standard with G92, very similar to the '87 IROC-Z L98. All L98s came standard with the 3.27 gears, oil cooler and G92 as standard, but didn't have the G92 code.

 

So is that exclusive to 1987 or something?

 

I admit I'm not as good on the Camaro side and I'm not sure I follow what Scott said. That said, our tech data for 1987 shows the 3.08 gears as standard on the LB9/M5 with the G92 as an option:
https://www.thirdgen.org/1987-chevy-camaro/

However, this is a Z49 car and all the available records show the Z49s in 1987 came standard with the 3.45s with the 305/5-speed and thus G92 wouldn't be an option since it's already present minus the code.

 

Interesting. So that should mean it had the hotter TPI 305 cam as well even if it is lacking the dual cat exhaust setup. I don't believe this car has the stock camshaft in it anymore anyhow but I will see when we pull the engine out and open it up.

 

The 3.45 gearing was the performance gear. All 1987 IROC-Zs with the LB9/5-speed combo came with the 3.45 gearing. So, they have G92 as a standard and won't have the RPO. The 3.08 gears are standard on all other cars with LB9/5 speed.

Like I mentioned, all 1987 L98 cars also came standard with the G92 options (3.27 in the auto), but doesn't have the code listed either since it was standard.

 

I've actually seen a couple or so GU4 3.08, 5 speed, '87 IROCs. The overwhelming majority are 3.45.

 

I forgot I've got the order guide for 1987 Camaro and it does also agree with the tech data that I quoted where 3.45 is optional while 3.08 was standard. This is the chart for the B4Z-Z28:


Note this was an early print as there is no L98 referenced.

 

And don't forget this from the order forms. Notice the 3 asterisk on the 3.08 for the 5.0 liter TPI V8. Under the box, it states that the 3.45 was standard on the IROC-Z, which means the 3.08 was standard on the Z28.

 

Yours shows the 5.7L where mine doesn't due to an apparent earlier print.

So in that regard, was this a change shortly after 1987 MY? Charlie states seeing a few non 3.45 gears and my early sheet supports that. Since your sheet shows the 5.7L, it was a revision at some point.

Here was the full sheet. So it's the correct application:

 

Every SPID label I have for an '87 LB9 MM5 car also has GM3. I don't have any other axle codes in my archive.

My opinion is that Charlie just wants to start trouble!! YOU WILL BE UNMASKED, CHARLIE!

 

Oh, man. It's about to get real!

 

I looked at the PDF that you can download from GM's Heritage site, which I believe is where you got the power team sheet (mine came from a dealer manual I have), and I noticed this sheet:


Notice this also states the 3.08 was standard on the 5-speed 305 for the Z28/IROC with 3.45 under the optional.

Still looks to me this was some sort of change in the 1987 MY based on different GM documentation. Or an error that populated through the documentation and passed different revisions.