hartsmike

Title reads as an 86 Z 28 but the Vin is causing me confusion. It's a 305 tpi with 700R4 and 4 wheel disk breaks. It's leading me to think it may have been a hold over 85 IROC. What do you guys think?

1G1FP87F7GL169450

Motown

The tenth digit is the year of the car.

C=82, D=83, E=84, F=85, G=86

chazman

iTrader: (4)

What would make you think that?

hartsmike

Looking up some of the numbers, they are showing they are for 85' IROC..

chazman

iTrader: (4)

Like which ones?

navy02ws6

AFAIK, there is no way to tell a Z28 from an IROC from the VIN alone. It could be either.

sofakingdom

iTrader: (1)

The only numbers I see, say "86".

It has "F" in the 8th char of the VIN. Would be "E" if it was 85. That's all there is to that. The VIN does not lie.

chazman

iTrader: (4)

No not from the VIN, but how would you think it was an '85?

hartsmike

I ran some of the numbers last night while I was looking it up and best I can remember if they were transplanted to the 85' year it would list as IROC. First thing I noticed about car is that it has four disk breaks (not necessarily rare but kind of uncommon).

hartsmike

Would GM have held some 85's over and restamped them 86'?

chazman

iTrader: (4)

I still don't know what would make you think it's an '85 when the VIN clearly states it's an '86. Four wheel disc brakes was a common option from '82 through '92.

gt4373

As Other's Have Said,VIN's Don't Lie It's A 1986.

sofakingdom

iTrader: (1)

No.

There are FEDERAL LAWS concerning that sort of thing. The car IS what it IS, and was stamped accordingly.

Fuhgeddaboudit. The car is a 86, plain and simple. I have no clue what's put this 85 bug in your mind, but it's WRONG, and it would be a great idea to clear it out once and for all.

scottmoyer

Can you also stop referring to the car as an 85 foot car or an 86 foot car? The apostrophe goes before the digits to show a shortened year, not after. Remember that an apostrophe marks the place where letters have been omitted. An apostrophe is also used to indicate the omission of the first two digits of a year or years.

As to this post, I'm also trying to understand why you think the car may be an '85. The '86 Z28 could come with the 305 TPI and J65 brakes. All IROC-Zs have the Z28 RPO code, so the title saying it's a Z28, is correct. Now, if the car has the RPO B4Z, then you have an IROC Z28. If there is no B4Z, then the car is a regular Z28, not an IROC-Z.

Please provide more detail into what you're looking at and we'll help you understand the car more.

studebaker60

Gonna start here. Bought a 91 firebird, formula, LO3 engine a couple years ago. What has me confused is the "plastic" lower ground effects and the " T/A" bird on the hood as well as the "bird of prey" decals on the B post. Were those standard on the firebirds or were those added after the fact? The car was originally green with gold graphics. Thanks for the input

JT

iTrader: (1)

Formulas didn't have ground effects. The large hood bird wasn't an option on anything but the Trans Am and 1987 was the last year it was available. Also, Formulas had the bulge hood.

If this is pictures of your car:
https://www.thirdgen.org/forums/body...ml#post5934655

Make sure you actually have a Formula, not just by the VIN because a base Firebird and Formula have the same 1G2FS VIN prefix, but by the SPID showing W66 for Formula. You may have a base Firebird as your pictures suggest it's a base Firebird.

studebaker60

Ok thanks. Not sure what you mean by SPID, but at least if I hack up a car, it's not a "gas monkey" resto.. lol

DynoDave43

iTrader: (11)

The Service Parts Identification (SPID) label is the label in the center console glove box with the cars VIN number, and all of it's RPO numbers on it.

JT

iTrader: (1)

If the SPID is missing, PM me the VIN and I can look at the RPO codes that would have been on the SPID to see if it's a Formula (W66) or not.

scottmoyer

The SPID is the label inside the center console or rear lock box. It has the VIN and multiple lines of 3 letter/number combinations. Those are the RPO codes of the options built in the car. Look for W66 for the Formula. Also, verify the VIN on the label matches the car, just to be sure the codes are for the correct car.

**edit** Looks like I said the same as DynoDave but he submit before me. Duplicate info now.

B4C5.7

iTrader: (2)

Do what you want to the car and enjoy it..it is your car and it does not matter what others think. Drive that thing and smile.

ray jr

iTrader: (2)

its a 305 tpi so the 8th digit of the vin would be "F" for an 85 or 86 not a "E"

sofakingdom

iTrader: (1)

Sorry; 10th digit is the year, not 8th. Brain cramp on my part.

"F" in the 10th digit = 86. Period.

Motown

Then why is my 85's tenth digit F?

From post 2:

scottmoyer

"F" in the 10th digit is 1985. Too much confusion has been added to this thread.

sofakingdom

iTrader: (1)

Dammit, I hate it when I outsmart myself!!

Sorry. I should go back and re-read stuff sometimes.

The OP's VIN (...F7GL... has "G" for the year digit; the code for "86". His car is a 86.

Ty92Z

iTrader: (11)

lol! Is it true? You were actually wrong? It's ok, every man must live up to his name at some point in life, guess this was your one time.

sofakingdom

iTrader: (1)

Yes it is true. I screwed up. I really really really try hard not to, but occasionally, my human half takes over and drives me off a cliff or something.

okfoz

The Gold emblems were a special sticker appearance package thing back on I think 91 or 92, maybe both years. It was supposed to be a cosmetic upgrade to give the "GTA" Look. They only had the small stickers, a large Hood bird was not part of the package. If memory serves they were the standard sized sticker, just in Gold, not Silver or Argent.