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Old Oct 6, 2015 | 10:43 PM
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Default Engine # id

I was checking this engine out on a 67 i'm looking to buy and freshen up, but the numbers are confusing me. I could use some help. Here is the stamped #'s : VII23HO (ALL CAPS)

thanks for any info.

Last edited by GILSWHO; Oct 6, 2015 at 10:46 PM.
Old Oct 6, 2015 | 11:43 PM
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Originally Posted by GILSWHO
I was checking this engine out on a 67 i'm looking to buy and freshen up, but the numbers are confusing me. I could use some help. Here is the stamped #'s : VII23HO (ALL CAPS)

thanks for any info.
A ’67 engine stamped VII23HO, means it was assembled at the Flint engine plant on November 23, 1966 as a 300HP/327 with an automatic transmission (Powerglide). I say it like that because Flint used the HO engine suffix during other years going back to '65 (250HP/327, at) and forward to '68 (300HP/327, at).

The '67 block casting number should be 3892657 with a date code before November 23, 1966. If the engine is original to the car, the stamp pad should also have a VIN derivative starting with 71..... followed by the last five digits of the VIN.

Last edited by Mike67nv; Oct 7, 2015 at 09:25 PM.
Old Oct 7, 2015 | 07:02 PM
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Originally Posted by Mike67nv
If the engine is original to the car, the stamp pad should also have a VIN derivative starting with 71 followed by the last five digits of the VIN.
Changed "7S1" to "71" (there was no "S" in the stamp pad VIN derivative in 1967.
Old Oct 7, 2015 | 09:24 PM
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Originally Posted by JohnZ
Changed "7S1" to "71" (there was no "S" in the stamp pad VIN derivative in 1967.
John - you're right of course. I must have been thinking transmission VIN derivative when I wrote that.
Old Oct 7, 2015 | 09:33 PM
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The 11 actually looks like the letters II. Any ideas? thanks
Old Oct 7, 2015 | 09:35 PM
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Originally Posted by Mike67nv
A ’67 engine stamped VII23HO, means it was assembled at the Flint engine plant on November 23, 1966 as a 300HP/327 with an automatic transmission (Powerglide). I say it like that because Flint used the HO engine suffix during other years going back to '65 (250HP/327, at) and forward to '68 (300HP/327, at).

The '67 block casting number should be 3892657 with a date code before November 23, 1966. If the engine is original to the car, the stamp pad should also have a VIN derivative starting with 71..... followed by the last five digits of the VIN.
The 11 actually looks like the letters II. Everything else matches up. Any ideas ? Thanks
Old Oct 7, 2015 | 09:40 PM
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Originally Posted by GILSWHO
The 11 actually looks like the letters II. Everything else matches up. Any ideas ? Thanks
The "I" character was used in place of the "1" character in the engine plant stamp - it was perfectly normal.

Here's a stamp pad pic I had handy - it's a big block, but you can see the use of the character "I" in the engine plant stamp. It also shows an example of a '67 VIN derivative.


Last edited by Mike67nv; Oct 7, 2015 at 09:52 PM.
Old Oct 7, 2015 | 10:00 PM
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Originally Posted by Mike67nv
The "I" character was used in place of the "1" character in the engine plant stamp - it was perfectly normal.

Here's a stamp pad pic I had handy - it's a big block, but you can see the use of the character "I" in the engine plant stamp. It also shows an example of a '67 VIN derivative.

Thanks Mike. Greatly appreciated.
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Old Apr 19, 2023 | 07:01 PM
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My understanding is that sometime the guy who stamped the engine pad would use an "I" instead of a number one some of the time. No, QC for stamping engines back in those days... Long hours worked at GM plants pushing out there new big blocks 427's mistakes where made.
Old Apr 19, 2023 | 07:27 PM
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Originally Posted by C2john
My understanding is that sometime the guy who stamped the engine pad would use an "I" instead of a number one some of the time. No, QC for stamping engines back in those days... Long hours worked at GM plants pushing out there new big blocks 427's mistakes where made.
Correct. However, this thread is 7.5 years old.

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