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Author Topic: Delco booster date decode  (Read 4520 times)
My68SS
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« on: February 10, 2007, 12:32:32 PM »

Hi crew, the power brake booster in my 12C built 68 has 326 stamped into the front of the top lock tab, and 9078 stamped into the rear of the same tab.
Is the 326 a julian date - 326th day of the year? If so, how is the year determined?
Do the numbers look right for my car build date?
TIA
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Rob
1968 L34/M40 SS
12 bolt posi 3.55
Build - 12C
baldeaglemtnman
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« Reply #1 on: February 10, 2007, 01:38:54 PM »

9078 is a 68 Camaro per Jonesy at Team Camaro.   http://www.camaros.net/forums/showthread.php?t=55781
Julian calender 001 = Jan. 1  365 = Dec. 31  1968 was a leap year so 326 would be Nov. 21 if I counted right.
Don't know the lead time on component parts but a month prior seems reasonable for your car.
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Steve

69 Z/28
Jerry@CHP
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« Reply #2 on: February 10, 2007, 02:08:31 PM »

I would say it's the real deal.  This booster SHOULD NOT have the "Delco Morane" stamped on the front cover.  That should confirm it.  Over the years, many have sawpped out the front covers.

Jerry
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1968RSZ28
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« Reply #3 on: February 10, 2007, 02:30:03 PM »

Hi Rob -

   I just checked the power brake booster on my 02C Los Angeles built '68 Z/28.  It is also stamped 9078 on the back of the tab.  My julian date stamp on the front of this tab is 343.  When I count to 343 on a 1967 calendar I come up with December 9, 1967 which is a  Saturday!   Huh

Jerry -
 
   Have you seen a Saturday date on these brake boosters before?

Paul  
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Jerry@CHP
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« Reply #4 on: February 10, 2007, 04:41:11 PM »

Yes, I have.  When I interviewed many of the Norwood plant workers who were transfered to Baltimore, I had asked them about that.  During that time period, I was told that there was no shortage of overtime for the plant workers.  Maybe John Z can jump in and tell us more?

Jerry
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My68SS
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« Reply #5 on: February 10, 2007, 09:21:51 PM »

I would say it's the real deal.  This booster SHOULD NOT have the "Delco Morane" stamped on the front cover.  That should confirm it.  Over the years, many have sawpped out the front covers.

Jerry
You are so on the money Jerry!   Smiley   That is exactly the case, no 'delco moraine' stamp anywhere.
Your comment has precisely answered my next question regarding that stamping, as I know for almost certainty that this is the original booster to the car.

As for determining the year, is 9078 just a sequence number that is known to represent 1968?
What would the numbers be for 1967 and 1969?

Many thanks everyone for their input  Smiley
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Rob
1968 L34/M40 SS
12 bolt posi 3.55
Build - 12C
1968RSZ28
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« Reply #6 on: February 10, 2007, 09:37:45 PM »

Yes, I have.  When I interviewed many of the Norwood plant workers who were transfered to Baltimore, I had asked them about that.  During that time period, I was told that there was no shortage of overtime for the plant workers.  Maybe John Z can jump in and tell us more?

Jerry

Jerry -

   Thanks again!  Once again, your expertise has cured my anxiety.   Grin

Paul
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My68SS
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« Reply #7 on: February 10, 2007, 09:39:38 PM »

After some more thought, given my car was built late 67, the 9078 number must represent the 'model' year 1968 ?
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Rob
1968 L34/M40 SS
12 bolt posi 3.55
Build - 12C
1968RSZ28
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« Reply #8 on: February 10, 2007, 10:17:35 PM »

Rob -

   I will quote from Jerry's book in an attempt to help:  "all 1967 and early 1968 Z/28 power brake boosters were stamped 8515.  Mid and late production 1968 Z/28 power brake boosters were stamped 9078."  I'd recommend both of his books even if you don't have a Z/28.  Here's the link:

http://www.z28camaro.com/index.html

Paul    
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My68SS
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« Reply #9 on: February 10, 2007, 10:54:19 PM »

Thanks Paul, I guess late Dec 67 has to qualify as 'mid' 68 model production, though it is only about 1/3 the way through the 68 model year.
Mine must have been amongst the first to get the 9078 number?
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Rob
1968 L34/M40 SS
12 bolt posi 3.55
Build - 12C
Jerry@CHP
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« Reply #10 on: February 10, 2007, 11:00:41 PM »

1969's use a 9204, and there are two different size number characters that were used in 1969.  The early '69's use a large 1/4" stamp while the later boosters after Jan-Feb 1969 use a smaller 1/8" stamped number.

Jerry
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JohnZ
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« Reply #11 on: February 11, 2007, 02:45:28 PM »

The 9078 and 9204 are derivatives of the Delco-Moraine part number for the booster assembly, although the "tab number" isn't always the same as the last four digits of the Delco part number; the 3-digit number is a Julian date.

Saturday overtime was very common in the assembly plants as well as in the component supplier plants.
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'69 Z/28
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