Fender extension markings

[DM69SS]

I need to have some small touch up work done on a 26k survivor L78 (endura bumper paint cracking). I decided to take stuff further apart just to clean everything up really well. The fender extensions each have a white "6" marked on the inside of them. Any idea what these were for? I'm just curious as I can't recall seeing them mentioned. Thanks!

[William]

The fenders were pierced for badging by Chevrolet. Box 103 on the BBC has a code for it. There was some worker shorthand on the line; COPO extensions are often marked 427 M.

In your case a 6 could indicate 396 badging.

[m22mike]

William
I had one COPO resto with 427M on the fender extension, always wondered what the &quot;M&quot; was for <<GRAEMLIN_URL>>/dunno.gif enlighten me... <<GRAEMLIN_URL>>/biggthumpup.gif

[William]

Best guess, Motor. Otherwise easily confused with the unit sequence number, also 3 digits.

[m22mike]

OK, makes sense. I guessed at one time it was for Muncie.

Mike

[bkhpah]

It is my experience that the &quot;6&quot; is short hand for 396...BKH

[MosportGreen66]

What about &quot;M&quot; for M40?

[William]

427 M also seen on 4-speeds.

[MosportGreen66]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: William</div><div class="ubbcode-body">427 M also seen on 4-speeds. </div></div>

I figured that would be too easy

Any insight from Phil during his Echos of Norwood research?

[Billohio]

These are http://www.yenko.net/ubbthreads/pics/usergals/2015/12/full-13064-36407-rps20151219_090310.jpg
http://www.yenko.net/ubbthreads/pics/usergals/2015/12/full-13064-36408-rps20151219_090246.jpg
on my Z. Friend says these are swap meet parts!

[sixt9rsx33]

Fender extension on my 69 RS Z prior to paint.

[sixt9rsx33]

Ran across this photo of the other fender extension on the 69 RSZ

[Charley Lillard]

The blue RS ZL1http://www.yenko.net/ubbthreads/pics/usergals/2015/12/full-23-36572-11_7_06_007.jpg
http://www.yenko.net/ubbthreads/pics/usergals/2015/12/full-23-36573-11_7_06_008.jpg

[Keith Seymore]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: MosportGreen66</div><div class="ubbcode-body">What about &quot;M&quot; for M40?

</div></div>

Probably not, since it could also be interpreted as M20/M21 (whichever was used).

Also - the fender guy doesn't really need to know the transmission type, since there was not an emblem installed on the fender to denote such or any kind of packaging to accommodate. So no &quot;heads up&quot; markings would be required.

K

[firstgenaddict]

From what I understand these are instructions for piercing fenders for trim and emblems...
These are the codes I have seen personally...
427 M is COPO Style Trim
G R is Z28 Rally Sport
G M Z28 Style trim
427 R is COPO Rallysport

FWIW the engine RPO code on the body broadcast for the Z28 is G.

[cook_dw]

Here is another to add to the list.

6S

This was from a 68 Bronze bb vert.