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[C2] Help with the block date code

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Old Feb 5, 2026 | 09:43 AM
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Default Help with the block date code
I have a 63 convertible with a replacement block. The block is the correct casting number for a 63. Below is a picture of the date code. Can someone help me with the date. Thanks.

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Old Feb 5, 2026 | 09:59 AM
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Jan 10 1963?

year hard to make out.

Assembly stamp and suffix?
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Old Feb 5, 2026 | 10:42 AM
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Looks like A 10 3 to me, also.
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Old Feb 5, 2026 | 11:10 AM
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Probably not a Flint corvette block. Tonawanda blocks used a different date format. Does it have the 1/4 inch plug above the timing chain cover?
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Old Feb 5, 2026 | 02:50 PM
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It looks like A1063 which be a Tonawanda not Flint block.
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Old Feb 5, 2026 | 04:19 PM
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yes I believe it is a Tonawanda block. Like I said it is not the original engine. I twas replaced sometime in 2000.
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Old Feb 5, 2026 | 04:19 PM
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I will look for this next week.
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Old Feb 6, 2026 | 08:03 AM
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if it's a Tonawanda block the block casting numbers will be smaller in height also.
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