837 alternator
 

I'd like to hear opinions on this 837 alternator's stamping.

https://www.yenko.net/ubbthreads/pics...2-dscf8010.jpg

Re: 837 alternator
 

It compares favorably with the examples I have.

Re: 837 alternator
 

I say no good. Look carefully at the 37 in the 837.

Re: 837 alternator
 

Not sure about that one ?. Not sure 9C12 is a known good date [img]<<GRAEMLIN_URL>>/dunno.gif[/img] Here are some 9C7 and 9C24

https://www.yenko.net/ubbthreads/pics...19-9c7_837.jpg

https://www.yenko.net/ubbthreads/pics...34721-9c24.jpg

https://www.yenko.net/ubbthreads/pics...-837_9c7_2.jpg

https://www.yenko.net/ubbthreads/pics...2-837_9c24.jpg

Re: 837 alternator
 

The entire 1100837 37A stamp matches what I have.

If you were going to re-stamp one would you pick a date that 'wasn't known'?

Re: 837 alternator
 

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: William</div><div class="ubbcode-body">The entire 1100837 37A stamp matches what I have.

If you were going to re-stamp one would you pick a date that 'wasn't known'? </div></div>

William can you post your stamp example. I've seen other anomaly's but when I see two or more alike I either accept it as real or suspect its the same re-stampers work.

Re: 837 alternator
 

I'm pretty sure I see the remnants of a 4.

Re: 837 alternator
 

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: William</div><div class="ubbcode-body">The entire 1100837 37A stamp matches what I have.

If you were going to re-stamp one would you pick a date that 'wasn't known'? </div></div>

Yes, it's done frequently, I have pic's of some.
Just like mistakes and bogus info on repop trim tags.

Mike

Re: 837 alternator
 

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: L78steve</div><div class="ubbcode-body">I'm pretty sure I see the remnants of a 4. </div></div>im with you Steve. If you blow up the pic, you can see remnants of a 4.

Re: 837 alternator
 

Thanks guys for your opinions.
I think I see what you're saying about the &quot;4&quot; remnants.

Re: 837 alternator
 

Spotted the 4 and then saw Steve's post. Looks like an 834 someone tried to make more pricey!

Re: 837 alternator
 

Have to admit the forgers are getting better.

Re: 837 alternator
 

That is why, collectively, we usually can come up with the good date codes. [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img]

Re: 837 alternator
 

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: L78steve</div><div class="ubbcode-body">Have to admit the forgers are getting better. </div></div>

I agree with that. Very well done.

Re: 837 alternator
 

Thought I posted this question earlier...

When a date is 'massaged'...isn't the surface of the housing altered?

I would think it would have to be ground down or milled to create a clean surface for the re-stamp...

just trying to understand the process.

wilma [img]<<GRAEMLIN_URL>>/hmmm.gif[/img]

Re: 837 alternator
 

I think they sandblast the area until the unwanted stamp disappears. Then re-stamp.

Re: 837 alternator
 

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: WILMASBOYL78</div><div class="ubbcode-body">Thought I posted this question earlier...

When a date is 'massaged'...isn't the surface of the housing altered?

I would think it would have to be ground down or milled to create a clean surface for the re-stamp...

just trying to understand the process.

wilma [img]<<GRAEMLIN_URL>>/hmmm.gif[/img] </div></div>

I agree.
I looked as best I could for signs of the surface being &quot;massaged&quot;, but it looks pretty even around the 37.

Re: 837 alternator
 

The &quot;7&quot; always seems to tell the tale, if you look at the 37A, the 7 has a little &quot;swale&quot; to it (pushed out stamping)that is how most of the &quot;7's&quot; in the 837 p/n sequence look as well. The &quot;7&quot; in the p/n is crisp, too crisp

Re: 837 alternator
 

Good eyes guys! probably a good policy (when buying an 837) to look for an original (not sand blasted) skin. Mike's photos show the surface to look for. Similar to block stamps that have been &quot;aged&quot; with acid - don't just pay attention to the numbers, look for the surface that they are stamped onto.

Re: 837 alternator
 

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: William</div><div class="ubbcode-body">The entire 1100837 37A stamp matches what I have.

If you were going to re-stamp one would you pick a date that 'wasn't known'? </div></div>

Well, he might not, but some of the guys restamping this stuff aren't always that smart.

Just as an example, below is one of the worst DZ block restamps of all time, especially considering 1969 was NOT leap year.

Re: 837 alternator
 

How about this? It's actually real.

https://www.yenko.net/ubbthreads/pics...64-v0838dz.png

Re: 837 alternator
 

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: William</div><div class="ubbcode-body">How about this? It's actually real.

https://www.yenko.net/ubbthreads/pics...64-v0838dz.png
</div></div>

Hey! That's my B-day!


A BITD response would be, &quot;that's outta sight man.&quot;

Re: 837 alternator
 

I have another example from that same day..

Re: 837 alternator
 

I know of five Z/28s with that date. My SWAG is they meant August 29 or 31.

Re: 837 alternator
 

Add one more to your list.

Re: 837 alternator
 

SWAG = Scientific Wild-Assed Guess?

Re: 837 alternator
 

btw, that may just be a mark under the 7, not a 4. How would you fill in the 4 and make the surface look that good?
But I don't think I'd risk my $$ on that one.

Re: 837 alternator
 

Kurt have you seen any other 837 dated 9C12?

Re: 837 alternator
 

Here is a pic of the one I found on my car.....re-stamped. Have a real one now.

https://www.yenko.net/ubbthreads/pics...-alt_no_rs.jpg

Re: 837 alternator
 

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ZLP955</div><div class="ubbcode-body">SWAG = Scientific Wild-Assed Guess? </div></div>

Yup!

A thought I have about 837s is that some dates may be plant-specific. I have a few dates that are known [8L30, 9F2] but no Camaro examples to date. Possible that an entire days' 837 production was shipped to one plant and only used there.

Re: 837 alternator
 

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Kurt S</div><div class="ubbcode-body">btw, that may just be a mark under the 7, not a 4. How would you fill in the 4 and make the surface look that good?
But I don't think I'd risk my $$ on that one. </div></div>

I have no idea how the manipulation is done. It is my understanding that heat can be applied and that stamps close up?

There were a couple of guys who got caught restamping OLDs parts for years and selling them off as authentic. I have seen many of the parts and it is not easy to tell on some,

Re: 837 alternator
 

Are there any legitimate stamps where the worker stamped a T instead of a V for the engine plant?

Re: 837 alternator
 

If you are looking at a solid lifter engine with a T prefix from the late 60's, I believe the answer is &quot;no&quot;.

Re: 837 alternator
 

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: sixt9rsx33</div><div class="ubbcode-body">Are there any legitimate stamps where the worker stamped a T instead of a V for the engine plant? </div></div>
I would think that although the overall gang stamps changed daily, the V and T remained in place at Flint and Tonawanda (respectively) as constants, and in the same way the month remained unchanged from first to last day, only the day and application suffix would be adjusted daily.

Re: 837 alternator
 

I've heard there are other ways of manipulating the metal.
So it sounds like they are better than I realized....

No on the V vs T stamps.

Re: 837 alternator
 

When you stamp metal......what ever you stamp down, moves up in the surrounding area.....So....The same amount of metal is still there....it just moved slightly......A person with a little patience can carefully work the metal back down to where it came from and basically reverse the process........It's just metal, it's not magic......

Ken

Re: 837 alternator
 

What do you guys think of this alternator stamping in the attached photo? https://www.yenko.net/ubbthreads/pics...-35800-837.png

Re: 837 alternator
 

Best to remove it and get some better shots.

Re: 837 alternator
 

Here is a better photo. https://www.yenko.net/ubbthreads/pics...7-100_7003.jpg

Re: 837 alternator
 

I say its good.