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Author Topic: 9204 brake booster on ebay  (Read 4579 times)
Mike S
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« Reply #15 on: November 13, 2012, 05:20:52 PM »

 Hi Jerry,

  Are you sure? Those can't be 1/4" fonts. The pad itself is about 1/4" in height. I took a caliper out and measured my 8515 and early 9204 numbers at approximately .125" (~ 1/8") in height. Looking at later model booster I measured those smaller fonts at approximately .0635 (~ 1/16") height.

Mike
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67 LOS SS/RS L35 Hardtop - Original w/UOIT
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Jerry@CHP
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« Reply #16 on: November 14, 2012, 01:57:38 PM »

You are correct, my mistake.
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z28z11
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« Reply #17 on: November 19, 2012, 09:03:39 AM »

My 01C X77 booster (owned since 1973, removed from car in 1980) is dated "2" , 9204, small font, "Delco Morraine" upside down under the vacuum port , absolutely original to the car. Almost too good of shape to be sent out for replate - plating is faded but pretty decent (likely due to the fact it hasn't been on the car for 32 years).

Regards,
Steve
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1968 Z28 BRG/W
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1969 X66 L78 Cortez/BVT
1969 Z11 L48
Stingr69
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« Reply #18 on: November 19, 2012, 12:07:12 PM »

Another data point - My early '69 (10A) has the original master cylinder/cover and booster rebuilt by Steve Gregori. It does have the upside down Delco stamping but does not have the "9204" stamps - blank pads.

-Mark.
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69Z28-RS
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« Reply #19 on: February 22, 2013, 03:43:57 PM »

I received my original booster back today, after rebuild by Steve Grigori (Brake Boosters, Inc).   he does a nice job for a very reasonable price.. I'm pleased.   and the stamped codes are much easier to read now after the cleaning and replating.   
My car is a late 09C car, with '9204' booster, date 199.   
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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
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NoYenko
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« Reply #20 on: February 22, 2013, 06:58:27 PM »

Another data point. Early 69 Nor 11A /Date stamp 310/Unit stamp 9204/Upside down Delco stamp. George
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Mike S
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« Reply #21 on: February 22, 2013, 07:40:18 PM »

Gary & George,

  What size font for the Julian date? 1/16" or 2/16" ?

Thanks,
Mike
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67 LOS SS/RS L35 Hardtop - Original w/UOIT
67 NOR SS/RS L35 Convertible - Restored
69Z28-RS
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« Reply #22 on: February 22, 2013, 10:53:29 PM »

I just went down and measured mine..    4/32"  or 1/8" ...   the julian date '199' is inverted (when top is up)..  '9204' is not inverted.
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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
NoYenko
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« Reply #23 on: February 23, 2013, 03:06:49 PM »

Mike, My stamp was a double strike but it measures 1/8" both date and unit stamp. George
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Mike S
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« Reply #24 on: February 23, 2013, 03:32:10 PM »

Excellent! That fills in the gaps and starts to show a pattern from the sample size below.

Late 1968
Trim Tag   Julian Date  Delco Stamp  Font size (1/8)
date      
shelf        334                    no      large
09C        199                   yes       large
10A        none                 yes       N/A
11A        310                   yes       large
      

1969        Julian Date   Delco Stamp  Font size (1/16)
Trim Tag
date
01C              002               yes      small
02D              055               yes      small
05A              120               no       small
06A              140               yes      small
07A              148               yes      small


 This sample size is showing that late 68 used the larger 1/8 font and in 1969 it switched to the smaller 1/16 fonts.
In regards to the Delco stamp, the 2 deviations in the list are from the booster I have on the shelf and the 05A booster.
    The one I have on the shelf may very well have had the front shell replaced when it was restored back in the 1980s when looks were more important than keeping numbers intact.
    The 05A booster *may* have had the shell replaced but I cant comment on that being its not mine and I dont know its history.
But the data here sure shows the smaller font began around the Jan 1969 period.

Thank you,
Mike
« Last Edit: February 23, 2013, 04:02:18 PM by Mike S » Logged

67 LOS SS/RS L35 Hardtop - Original w/UOIT
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x77-69z28
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« Reply #25 on: February 23, 2013, 05:04:14 PM »

Mike, I wonder if it was lightly stamped and was cleaned up when the booster was restored? It is definitely original to the car.
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Mike S
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« Reply #26 on: February 23, 2013, 05:15:24 PM »

Mike, I wonder if it was lightly stamped and was cleaned up when the booster was restored? It is definitely original to the car.
  That could very well be the case. After I became more interested in this topic late last year I have looked at several original unrestored 69 boosters and many had such lightly stamped Delco markings that not all the characters were fully developed. So, if the metal is stripped down and polished during the restoration process then it's likely the remainder of the characters are removed.

Mike
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67 LOS SS/RS L35 Hardtop - Original w/UOIT
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69Z28-RS
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« Reply #27 on: February 23, 2013, 10:16:26 PM »

Mike,

My car is a LATE 09C (Sept 1969)..  I'm sorry if that throws a kink in your data.. Smiley
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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
Mike S
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« Reply #28 on: February 23, 2013, 11:00:03 PM »


   If you are certain that is original to your car then that does throw a deviation in this for sure.  Huh
Below is the updated list.

Late 1968
Trim Tag   Julian Date  Delco Stamp  Font size (1/8)
date     
shelf        334                    no      large
10A        none                 yes       N/A
11A        310                   yes       large
     

1969        Julian Date   Delco Stamp  Font size (1/16)
Trim Tag
date
01C              002               yes      small
02D              055               yes      small
05A              120               no       small
06A              140               yes      small
07A              148               yes      small
09C              199               yes      large
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67 LOS SS/RS L35 Hardtop - Original w/UOIT
67 NOR SS/RS L35 Convertible - Restored
69Z28-RS
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« Reply #29 on: February 24, 2013, 12:27:46 AM »

TO my knowledge it has never been changed.   It was on the car when I bought it in 1976, and it's 'dated' appropriately for my 09C car??   but everything is speculation/educated guesswork after 44 yrs..  Smiley
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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
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