C1 Decode cast and stamping date numbers
12-10-2017, 09:21 PM
#1
C1 Decode cast and stamping date numbers
Nolan Adams book on Restoration 53-62 Vol 1 has on page 392 paragraph 3 & 4 says engine blocks and parts have dates cast into them. Yes! Now paragraph 4 says Date coding was alphabetical and the letter "I" was omitted.
So if a block casting date on the rear has J... that is Sept. The stamping on the front of the block also is stamped F09... However NCRS judging manual says J is Oct. This throws the stamping date off. What's up with all that? Any help would be appreciated.
So if a block casting date on the rear has J... that is Sept. The stamping on the front of the block also is stamped F09... However NCRS judging manual says J is Oct. This throws the stamping date off. What's up with all that? Any help would be appreciated.
12-11-2017, 06:25 AM
#2
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Chevy didn't use the letter "I" for stamped date codes.
BUT, they did use the letter "I" for cast date codes.
The letter "I" in stamped codes is used in place of the number "1".
Hope this helps you figure things out.
BUT, they did use the letter "I" for cast date codes.
The letter "I" in stamped codes is used in place of the number "1".
Hope this helps you figure things out.
12-11-2017, 10:35 AM
#4
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2023 C1 of the Year Finalist - Modified
2015 C1 of the Year Finalist
And as a result, over many years, it has been confusing for many people when either searching for correct parts, OR, trying to interpret codes. And then, there are SOME parts which have ZERO date coding, such as exhaust manifolds------------and that makes it even worse!
On top of that, there is even more confusion when determining which plant a part or assembly came from, EVEN THOUGH IT HAS THE CORRECT CODES TO MATCH A PERSON'S CAR!!! Corvettes ONLY got certain parts, such as engine parts and rearends from ONE plant. So, you have to know what plant a part was manufactured at and how to tell what plant it came from.
12-11-2017, 10:35 AM
#5
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Nolan Adams book on Restoration 53-62 Vol 1 has on page 392 paragraph 3 & 4 says engine blocks and parts have dates cast into them. Yes! Now paragraph 4 says Date coding was alphabetical and the letter "I" was omitted.
So if a block casting date on the rear has J... that is Sept. The stamping on the front of the block also is stamped F09... However NCRS judging manual says J is Oct. This throws the stamping date off. What's up with all that? Any help would be appreciated.
So if a block casting date on the rear has J... that is Sept. The stamping on the front of the block also is stamped F09... However NCRS judging manual says J is Oct. This throws the stamping date off. What's up with all that? Any help would be appreciated.
F09 would be Flint... September (Ninth month)
In what context does the NCRS JG say that J is October?
12-11-2017, 10:41 AM
#6
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THAT IS CORRECT!!!
And as a result, over many years, it has been confusing for many people when either searching for correct parts, OR, trying to interpret codes. And then, there are SOME parts which have ZERO date coding, such as exhaust manifolds------------and that makes it even worse!
On top of that, there is even more confusion when determining which plant a part or assembly came from, EVEN THOUGH IT HAS THE CORRECT CODES TO MATCH A PERSON'S CAR!!! Corvettes ONLY got certain parts, such as engine parts and rearends from ONE plant. So, you have to know what plant a part was manufactured at and how to tell what plant it came from.
And as a result, over many years, it has been confusing for many people when either searching for correct parts, OR, trying to interpret codes. And then, there are SOME parts which have ZERO date coding, such as exhaust manifolds------------and that makes it even worse!
On top of that, there is even more confusion when determining which plant a part or assembly came from, EVEN THOUGH IT HAS THE CORRECT CODES TO MATCH A PERSON'S CAR!!! Corvettes ONLY got certain parts, such as engine parts and rearends from ONE plant. So, you have to know what plant a part was manufactured at and how to tell what plant it came from.
BUT, the most glaring example that I know of is the "two digit" year cast into parts from Tonawanda NY.Corvette (and other) castings come from Saginaw, commonly called Flint....
Flint parts have a "single digit year date". F 12 3 would be June 12, 1963.
Tonawanda parts have a "double digit year date". F 12 63 would be the same June 12, 1963 date.
Lots of embossed and debossed "T's" on Tonawanda castings too. Then you can get into the size of the engine block casting number..
12-11-2017, 01:29 PM
#7
The manual Vol 1 page 125 shows- Engine block casting date letter designation chart. This chart includes the letter I. which would be Oct.. The cast date on the heads is J as well .. ????
12-11-2017, 02:06 PM
#8
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Date Codes
Cast Date Codes (to represent month)
A = January
B = February
C = March
D = April
E = May
F = June
G = July
H = August
I = September
J = October
K = November
L = December
Stamped Date Codes (to represent month or day in engine assembly dates)
0 = 0
I = 1 (the digit 1 was NOT used, the letter I represents one.
2 = 2
3 = 3
4 = 4
5 = 5
6 = 6
7 = 7
8 = 8
9 = 9
Cast Date Codes (to represent month)
A = January
B = February
C = March
D = April
E = May
F = June
G = July
H = August
I = September
J = October
K = November
L = December
Stamped Date Codes (to represent month or day in engine assembly dates)
0 = 0
I = 1 (the digit 1 was NOT used, the letter I represents one.
2 = 2
3 = 3
4 = 4
5 = 5
6 = 6
7 = 7
8 = 8
9 = 9
Last edited by emccomas; 12-11-2017 at 02:09 PM.