[necdb3]

Originally Posted by Baron Von Zeppelin

I can't lay positive claim as to what got charged for unitized ignition , and what did not.
But the invoice doesn't list untized ignition.
And the engine code is for unitized ignition. fwiw

The 2 VIN's we are bouncing around are 7789 units apart.
Maybe the engine is a coincidental replacement that just happened to be really close in relationship to the parameters.
We might find out

72 formula 455 had mandatory unitized blocks so WM only on a 4spd.

72 T/A could be either way WD or WM by the way it was ordered.

Saying that, I'm not sure if unitized would show up as a charged item on a Formula on invoice separate or was it part of the charge for both "Ram Air" and "unitized".

[Johnny72TA]

Iam the owner of the 72 you have been helping di numbers on which I appreciate. I finally signed up for the forum below is a pic of the block number looks like I had it wrong after all
22N613624

[kingbuzzo]

Yet another photo... Sorry

Sent from my Surface Duo using Tapatalk

[unruhjonny]

Originally Posted by Johnny72TA

Iam the owner of the 72 you have been helping di numbers on which I appreciate. I finally signed up for the forum below is a pic of the block number looks like I had it wrong after all
22N613624

Well from what I’ve seen you have a great car!
the fact that it has a replacement manual transmission coded 1972 455HO from another Firebird is great!

I hope you enjoy the car!

[Baron Von Zeppelin]

It's going to be 513624
613624 would put the EUN way way too far out of sync.
If a 6xxxxx is even possible , 72 was a low production year on the whole Norwood deal.

But it's not hard to think it's a 6 by its current appearance.

[Baron Von Zeppelin]

I agree with unruhjonny - do whatever it needs and enjoy the heck out of it.
It's 1984 and you just bought a cool used TA - crack the whip on that mule.

[Baron Von Zeppelin]

The subject vehicle at some unknown time, when for sale in Illinois.
Looks like she got a deluxe interior , power window , and later year model power lock , upgrades.

[Johnny72TA]

I did buy the car in Illinois. When you say upgrades it didn't originally have deluxe interior , power windows and power door locks?
I find it a bit strange myself someone wouldn't have documented finding pretty much the exact motor that would have went in that car excluding the vin. But I'm sure you guys have seen all kinds of crazy stuff.
Earlier you mentioned the Eun I'm not familiar with that if you have time to explain Id love to learn.

[johnta1]

This explains it and has a form to upload data.

EUN Form

And this is page to see the data I have added.

EUN Search

[unruhjonny]

Originally Posted by Johnny72TA

I did buy the car in Illinois. When you say upgrades it didn't originally have deluxe interior , power windows and power door locks?
I find it a bit strange myself someone wouldn't have documented finding pretty much the exact motor that would have went in that car excluding the vin. But I'm sure you guys have seen all kinds of crazy stuff.
Earlier you mentioned the Eun I'm not familiar with that if you have time to explain Id love to learn.

Actually there is nothing odd about it;
Odds are the original motor was gone, and the person who put the car together found what they deemed to be the most correct motor to put in it.
The additional options fall under this as well - it used to be fairly common for people to change interiors or add period options as it suited them - and there was no downside to this, because the changes would often result in the car being worth more.

EUN = Engine Unit Number;
This number was stamped on the block at the time the engine was being assembled at the plant where it was made.
The engine unit number was recorded in factory documents for warranty purposes, when the car was originally sold.

[Baron Von Zeppelin]

Your car came with the Standard Interior when new.
Deluxe/Custom was an extra cost and would be shown on the Invoice.
I highly prefer Deluxe and would have also upgraded it myself.
Nicer door panels and nicer seat covers were the main attraction of the option.
A little -oh sh!t grab handle- for passenger, and some small detail items here and there.

Those might actually be 1971 comfort weave deluxe seat covers.
There are 2 or 3 different levels of quality of repo seat covers , from the way the driver seat looks compared to passenger seat - they probably used the cheaper brand.
They don't age well with actual use. Just for looks mostly.

Power windows are not on Invoice.
Power locks are not on Invoice.
And they didn't start putting the lock switches on the door panels until later up in the 70's.
In 72 there would just be 1 switch.
Located in the dash in that small blank panel below heater controls.

Numerous things are distinct to the 70-72 cars.
Dash Bezel and fenders are the most common items we routinely see replaced with later model items.

[Baron Von Zeppelin]

Nothing too strange about a correctly coded replacement engine .
Since the 80's restorers have been relocating proper replacement engines for upper crust cars.
Someone probably didn't realize that WD and WM meant anything different.
Yours should be WD , but I wouldn't lose sleep at this point.
Unless the actual true original WD block popped up with your VIN.

C087857 is your EUN engine unit number , termed by Pontiac.
They used that leading C character from 71 through mid'ish 73 - we don't know why.

That number goes up with every V8 production engine made/assembled at PMD.
So we are also able to use it as a reference to time and dates.
PMD in Michigan did all the casting machining assembling of all their engines.
Then they were shipped to the various plants that built the cars.

For them the EUN was a dual purpose identifier for quality control tracking and identifying.
When potential recalls or service issues became known - the bulletins would say to the effect -
Regarding engines 054321 through 234567.

Not very many people in the hobby have any idea what the EUN is or it's relevance.

[Baron Von Zeppelin]

There were also TUN - Transmission Unit Number , at least in earlier years.
On the older billing history cards 1967 through 1970 there were boxes to list EUN and TUN.
The old metal Protect-o-Plates had those numbers on them as well.

[kingbuzzo]

This is educational...thanks guys and congrats Johnny...you'll have the only one around these parts that's for sure...

[unruhjonny]

There are a LOT of cool cars hidden in your area;
The Winnipeg area was at the time a real hotbed for performance vehicles.

[kingbuzzo]

Oh definitely...just haven't seen too many early birds - people are still car crazy as ever here which is why I never left

[Baron Von Zeppelin]

On this factory billing document you can see where they list the EUN and TUN
Engine Unit No. & Trans Unit No.

[poncho-mike]

Two of my old cars were 72 T/A 4-spd cars with the distributor version of the 455HO. Both came with WD engines. I parted one of them out, I sold the other one in the late 1980s. It went to GA where it was restored, then I think to the west coast. I also parted out a 4-spd with unitized distributor, and I believe there was a separate line item on the PHS with a cost for unitized distributor. At one time I had a lot of PHS documents, but I'm not sure where they ended up.

[unruhjonny]

Originally Posted by kingbuzzo

Oh definitely...just haven't seen too many early birds - people are still car crazy as ever here which is why I never left

The winters, and the state of the economy (when compared to Calgary) were what ultimately made me move back west...
But the awful winters was the larger of those two factors.

Mine's a Birchwood car.

There used to be a blue 71/72 Formula which would come out on Sunday(?) nights;
I saw the red 74 Formula 455 that i almost got out a couple times too.

[Johnny72TA]

This is ALOT of great information you guys are sharing and very interesting thank you.
I should have used different words I find it odd this information wasn't passed on to me by the seller. Regardless its been very exciting thinking it could be close to the real deal but that has come down to earth. As for the interior this would explain why the seat frames are so rusty as they aren't the original and were probably in storage somewhere. I do really like the seats that are in it. I will have to look into if they are 71 or 72. As kingbuzzo chief ponti yacker mentioned we almost never see early birds here in Winnipeg. I mean I saw my first ever 1970 trans am this year that inevitably led to me getting the 1972 trans am. I'm excited to get working on it and look forward to learning more.