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Old 07-26-2016, 02:01 PM
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Default YA engine in a GTO

Just bought a 71 GTO and knew it was NOT a matching numbers car. The engine code is a YA stamping but the partial VIN number( Zxxxxxx) is where it is supposed to be; in fact it has a firm stamping and also a ghost stamping.
It doesn't make sense, at least to me , that someone would stamp the VIN number on a block with an obvious wrong engine code visible.
Any thoughts?
Thanks.
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Last edited by West Coast GTO; 07-26-2016 at 02:10 PM.
  #2  
Old 07-26-2016, 02:11 PM
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I'm not following this very good?

The partial VIN is where the YA is?

Or the 'Z' Fremont factory didn't use YA?

The block is a 1971 engine?

HFR has some pics of Fremont blocks with the partial VIN up around the engine code/motor unit number I think?



EDIT:
Pic wasn't there when I posted 1st

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Old 07-26-2016, 02:21 PM
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ghost stamp is a double tap..happens a lot..remember..some dude with a hammer is pounding on a gang stamp..if it isnt deep enough..they hit it again...or a restamp

you sure the "YA" is right? that makes sense to me that the YA would be wrong..people in general are stupid...ive seen codes stamped on top of codes to fake a high horse power etc...ive also seen factory codes messed up too...

lets see everything, better pics...of everything...date on the rear of the block too

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Old 07-26-2016, 04:21 PM
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My 455 is a YC but the guy I got it from restamped it YE. I knew what it was when I was buying it so I didn't care...but he had done that.

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Old 07-26-2016, 04:43 PM
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YA engine was a mid-year addition to the '71 line-up. It was used in Grand Prix and full-size. I don't think GP's were built at Fremont. Look for another partial VIN stamping up near the EUN and application code.

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Old 07-26-2016, 04:55 PM
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John,
The partial VIN is where it is supposed to be( close to the water pump hose outlets) and the YA engine code is where it is supposed to be( top of passenger head).
Attached is the engine code picture. I have some cleaning before I can get to the engine casting info.
It was my understanding that only YC engine codes were used for 71 GTO with the 455 ( 34P) engines. It is a Fremont car and the VIN, data plate and PHS coincide..



Quote:
Originally Posted by johnta1 View Post
I'm not following this very good?

The partial VIN is where the YA is?

Or the 'Z' Fremont factory didn't use YA?

The block is a 1971 engine?

HFR has some pics of Fremont blocks with the partial VIN up around the engine code/motor unit number I think?



EDIT:
Pic wasn't there when I posted 1st
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  #7  
Old 07-26-2016, 05:58 PM
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Quote:
Originally Posted by johnta1 View Post
I'm not following this very good?

The partial VIN is where the YA is?

Or the 'Z' Fremont factory didn't use YA?

The block is a 1971 engine?

HFR has some pics of Fremont blocks with the partial VIN up around the engine code/motor unit number I think?
He needs to check for one here, like the picture in this thread.
http://www.forums.maxperformanceinc....d.php?t=722788

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Old 07-26-2016, 07:11 PM
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Partial VIN by timing cover location- check.
YA stamping by top of head- check.
I was (and am) confused by a YA block in a 71 GTO. Why stamp (or re-stamp) a partial VIN on an engine block that was not installed in that body Pontiac.

Quote:
Originally Posted by Held for Ransom View Post
He needs to check for one here, like the picture in this thread.
http://www.forums.maxperformanceinc....d.php?t=722788

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Old 07-26-2016, 07:48 PM
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So, the partial VIN on it is for your car?


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Old 07-26-2016, 08:03 PM
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The partial VIN you've shown looks too big to be a Fremont stamping.

Why stamp a YA block with a GTO partial VIN? Why not, if you are asking a lot for the car and don't know any better. Or, former owner just wanted a partial VIN stamped for the replacement block that was installed.

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Old 07-26-2016, 08:41 PM
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Yes.
The car was not advertised as having a matching numbers block so it was a surprise that it has the partial VIN numbers on it. As far as the size of the stamping; I would have no clue as to what the correct size should be. Also, why would someone stamp twice?
HFR commented that it probably is a re-stamp to improve any resale.
A good possibility. Regardless, I now know that it is a 71 455 ( cast 485428) but still have not determined the build date yet.

Quote:
Originally Posted by johnta1 View Post
So, the partial VIN on it is for your car?


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Old 07-26-2016, 09:13 PM
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Again, it could have been done by a dealership. Imagine a warranty issue after warranty expires. Dealership finds a salvageable engine and bends over backwards to help a customer, unlike most nowadays.

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Old 10-17-2021, 03:45 PM
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Did you ever find the block date code for this engine? (and block cast code?)
Any other partial VIN's?

Some GP's were made in Fremont in 1971.
Also GTO;s.



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Old 10-17-2021, 05:16 PM
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my bet is very late Jan to mid Feb of '71 casting date.

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Old 10-18-2021, 02:12 AM
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Yes, block date code photo attached( don't know how to decode). Also stamped code does match the VIN code but appears to be a double( partial ) stamp.

Quote:
Originally Posted by johnta1 View Post
Did you ever find the block date code for this engine? (and block cast code?)
Any other partial VIN's?

Some GP's were made in Fremont in 1971.
Also GTO;s.


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  #16  
Old 10-18-2021, 03:43 AM
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1972 block cast november 22 1971.
Partial VIN misses 22 ahead of Z. (21 if it was a 1971 block.)

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Old 10-18-2021, 09:52 AM
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I worked at a Pontiac dealership in 1970, It wasn't at all uncommon for the service department to pull an engine out of a late model wreck they had sitting on the premises, and put in in a 1-2 year old car especially the performance cars (GTO, and T/A). The owners of the dealership were formerly in the scrap yard business, and were always buying late model wrecks from insurance companies to use in just this fashion. Good sheetmetal off the wrecks was also used by the body shop, and the insurance were charged for new parts. Most wrecks at that time were sold by insurance companies at 10% of used blue book price, this is before salvage auctions were used by insurance companies.

They would also defraud GM on warranty claims, and put used engines in under warranty claims. Having worked in GM dealerships, and knowing a good many people in GM service departments, I've seen, and heard, a lot of shady stuff go on under warranty claims to make the dealer more profit. If you know how GM pays warranty claims, as cheaply as possible for parts and labor, there is a lot of incentive to cheat the system with used parts, or aftermarket parts, instead of GM parts under warranty.

Just saying what I've seen and heard over the years working in GM dealerships, and how the OP could have the discussed engine in his car.

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Old 10-19-2021, 12:18 AM
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Quote:
Originally Posted by Kenth View Post
1972 block cast november 22 1971.
Partial VIN misses 22 ahead of Z. (21 if it was a 1971 block.)
This ^
should read 22Zxxxxxx on the partial VIN
it has been played with

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Old 10-19-2021, 08:37 AM
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Here are the stamped block VIN, EUN, and Codes from a Fremont built '71 GT-37 built in 12/1970 for reference.

Dennis
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  #20  
Old 10-19-2021, 09:39 AM
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Cool!

That being an early car, was the block a 9799140 casting?


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