CRG Discussion Forum
Welcome, Guest. Please login or register.
Did you miss your activation email?
October 31, 2014, 05:56:29 AM

Login with username, password and session length
Search:     Advanced search
Welcome to the CRG Discussion Forum!
Forum registration problems: Make sure you enter your email correctly and you check your spam box first. *Then* email KurtS2@gmail for help.
105860 Posts in 12353 Topics by 4762 Members
Latest Member: HarryQ
* Home Help Search Login Register
+  CRG Discussion Forum
|-+  Camaro Research Group Discussion
| |-+  Decoding/Numbers
| | |-+  Timing Cover date codes
« previous next »
Pages: [1] Print
Author Topic: Timing Cover date codes  (Read 2090 times)
Z10Mike
Member
***
Posts: 24


View Profile
« on: July 27, 2013, 12:44:32 PM »

Looked through all the threads on this subject and could not find a definitive set of guidelines for small block vs big block timing cover date code format.
So far the codes are supposedly week and year of production i.e.  21 69 is 21st week of 69, Julian calendar date vs year i.e. 21st DAY of 1969 or even MONTH of production vs year.  It also appears to vary from small block to big block . Can any of the guru's here summarize what the latest tribal knowledge is on these date codes?  THANKS...
Logged
MO
Member
***
Posts: 309


View Profile
« Reply #1 on: July 27, 2013, 08:39:39 PM »

I recently sold a small block cover dated A 67.
Logged
ZLP955
Member
***
Posts: 464



View Profile
« Reply #2 on: July 27, 2013, 09:53:34 PM »

On my work bench I have 2 of these, one is '34 69' and the other is '13 70'. Unless there were different date formats, I think the "month, year" format could be ruled out. If it was "Julian date, year" I would expect to see many with a 3-digit date, followed by year, but have never seen an xxx yy stamp, only xx yy (anyone else seen an xxx yy stamp?). So maybe it's "week, year", and if so, is it production week of model year (like gas tank date stamps) or calendar year weeks??
Logged

Tim - New South Wales, Australia
04A VN '69 z/28 69-69 715 ex-E/MP
JohnZ
CRG Member
*****
Posts: 4126


View Profile Email
« Reply #3 on: July 28, 2013, 10:51:22 AM »

I have a '69 DZ cover on the bench stamped "4 69", so it looks like the format is week/year, with the week most likely calendar, not model year.
Logged

'69 Z/28
Fathom Green
CRG
Mike S
Hero Member
*****
Posts: 1129



View Profile
« Reply #4 on: July 28, 2013, 01:04:49 PM »

Where on the BB cover is the date stamped? I'd like to look at mine.

Thanks,
Mike
Logged

67 LOS SS/RS L35 Hardtop - Original w/UOIT
67 NOR SS/RS L35 Convertible - Restored
1968 Z28
Member
***
Posts: 440


View Profile Email
« Reply #5 on: July 28, 2013, 06:06:33 PM »

I have a 1968 Z28 cover that is stamped "3 68".
Logged

Jerry G.

Z28-1968-07C-Norwood
Ermine White, Red Std. Interior
2nd. Owner, 38,000 miles
1968 Z28
Member
***
Posts: 440


View Profile Email
« Reply #6 on: July 28, 2013, 06:30:46 PM »

Where on the BB cover is the date stamped? I'd like to look at mine.

Thanks,
Mike
Mike.....can't say about the big block covers but if they are like the small block covers, you can only see the dates with the harmonic balancer pulled.  The best way is to have it removed, cleaned, and on the bench.
Logged

Jerry G.

Z28-1968-07C-Norwood
Ermine White, Red Std. Interior
2nd. Owner, 38,000 miles
KurtS
CRG Coordinator
*****
Posts: 3253


View Profile Email
« Reply #7 on: July 28, 2013, 08:07:29 PM »

I have one that is stamped with a different format. If I recall, it has a letter in it.
I won't be around it for a year, so I can't say the exact code. I think I posted the code before, but not positive.....
Logged

Kurt S
CRG
Z10Mike
Member
***
Posts: 24


View Profile
« Reply #8 on: July 28, 2013, 08:47:43 PM »

It sure looks like the small blocks are trending toward the week of production and year.  "3 68" would be 3rd week of calendar year 1968.  Could big blocks use a different format?  Kurt mentions a letter in the mix.  Was that for small block or big block?
Logged
Z10Mike
Member
***
Posts: 24


View Profile
« Reply #9 on: August 02, 2013, 06:04:38 PM »

Anybody out there with information on big block timing covers?  I might have a chance to dig through my parts this weekend and find a couple of examples to compare to others if posted.  Thanks to all who have commented to date.
Logged
KurtS
CRG Coordinator
*****
Posts: 3253


View Profile Email
« Reply #10 on: August 10, 2013, 01:52:00 AM »

It was a small block 69, big balancer. Might not have had a letter, but IIRC the week # was way too high / no year. Damn, that memory is fuzzy.
Logged

Kurt S
CRG
ZLP955
Member
***
Posts: 464



View Profile
« Reply #11 on: September 12, 2013, 08:34:11 PM »

Here's a 1969 dated BB timing cover, currently listed on ebay: http://www.ebay.com/itm/290976608998
Seems to follow the same date code format as the SB covers I have, if the stamp is '31 69'. If the '3' was upside-down, instead of the '1', then the date code would be '69 13' which is possible, but has anyone ever seen the year stamped first? (Date code images below)
Logged

Tim - New South Wales, Australia
04A VN '69 z/28 69-69 715 ex-E/MP
Stingr69
Member
***
Posts: 412


View Profile Email
« Reply #12 on: September 13, 2013, 11:27:37 AM »

There was more than 1 way to stamp a cover date.  I can't remember the exact details but I did have an email conversation with Jerry M. about it years ago.  I had a big balanceer SB cover with an odd date stamp.  He has seen some julian dates and some that just are clearly not Julian that he could not decode. My cover was not originally on my car so I never recorded the stamp, sorry.

-Mark.
Logged
69Z28-RS
Hero Member
*****
Posts: 2465


owner since '76


View Profile Email
« Reply #13 on: September 13, 2013, 12:34:20 PM »

I have one that is stamped '1   67' ..   which is obviously NOT Julian date (unless they worked on New years day?) *G*  but it *might* be for the first week of Jan...
Logged

Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe (2), 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55 Nomad, '57 Nomad, '57 B/A Sedan
Pages: [1] Print 
« previous next »
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2013, Simple Machines Valid XHTML 1.0! Valid CSS!
Page created in 0.108 seconds with 18 queries.