Author Topic: Muncie casting numbers on passenger side?  (Read 3619 times)

Maxsg1973

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Muncie casting numbers on passenger side?
« on: November 27, 2019, 06:15:06 AM »
How do you decipher these numbers? 13 6 ?


ZLP955

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Re: Muncie casting numbers on passenger side?
« Reply #1 on: November 27, 2019, 09:43:44 AM »
Perhaps a mold number?
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bcmiller

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Re: Muncie casting numbers on passenger side?
« Reply #2 on: November 27, 2019, 02:33:01 PM »
Yes possibly a mold number. Has no important meaning.
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69Z28-RS

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Re: Muncie casting numbers on passenger side?
« Reply #3 on: November 27, 2019, 02:55:24 PM »
Perhaps no important meaning to 'us' (fifty years later), but I'm also certain it had some important meaning to someone during the design/manufacturing phases...  :)    otherwise it would not be there.
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Maxsg1973

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Re: Muncie casting numbers on passenger side?
« Reply #4 on: November 28, 2019, 04:45:24 AM »
I'm trying to understand when this case was cast. Does anyone know where the casting dates are on a late 68 muncie case? I have read what I could find online but I don't see the two circles that are divided into two halves that is called the date marker.

rare396bronze

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Re: Muncie casting numbers on passenger side?
« Reply #5 on: November 28, 2019, 05:30:10 AM »
Go to the main forum page to drive train decode it will show you a picture. If it is the original it will be at the back of the main case going up the passenger side. Should have a date code and partial vin of your car. Hope this helps.

69Z28-RS

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Re: Muncie casting numbers on passenger side?
« Reply #6 on: November 28, 2019, 12:47:57 PM »
That stamped date would be the *assembly date* for the transmission, not the *cast date*...
.. but generally speaking, I don't think the cast date would not be very far in advance of the assembly date...
09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette, '60 Corvette, '72 Corvette
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan

Maxsg1973

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Re: Muncie casting numbers on passenger side?
« Reply #7 on: November 28, 2019, 01:46:20 PM »
I am familiar with my assembly date and vin stamps. I can see them clearly. My question is where do you find the cast date? All I see is the 163 number with two dots on the side.( see picture ) What am I missing? I have a feeling this is the cast date information but I can't find reference information on how to decipher. If someone has a a picture or knowledge of where the cast date is please post a picture if possible. My car is 68 L78.

TangoBravo

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Re: Muncie casting numbers on passenger side?
« Reply #8 on: November 28, 2019, 08:42:42 PM »
The 13 is a mold number. The 2 split circles seemed hit and miss and were used up through 68 model years. Likely the second large number is a month with the dots indicating the week. I have seen one case like this in Paul Cangialosi's book page 21. The second large number castings seemed to only last a short while. The casting dates later changed to a grid style around 1971 or so.

bertfam

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Re: Muncie casting numbers on passenger side?
« Reply #9 on: November 28, 2019, 09:29:20 PM »
Read THIS starting at reply 18.

Ed

luv2sixty9

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Re: Muncie casting numbers on passenger side?
« Reply #10 on: November 28, 2019, 11:08:39 PM »
I believe it was casted in May, so your car's build date is probably July.
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ZLP955

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Re: Muncie casting numbers on passenger side?
« Reply #11 on: November 29, 2019, 08:27:23 AM »
I believe it was casted in May
Where did you get that?
Tim in Australia.
1969 04A Van Nuys Z/28. Cortez Silver, Dark Blue interior, VE3, Z21, Z23, D55/U17, D80, flat hood.
Sold at Clippinger Chevrolet in Covina, CA.
AHRA Formula Stock at Lions Dragstrip, NHRA E/MP at Pomona Raceway