283 block identification

[roadcracks]

Good day.
I have just acquired a 283 block. The numbers 'stamped on the machined boss are 77 6471759 , see below, Can anyone direct me to a web site where I can determine what these numbers mean.
I've looked but run into a dead end.
The block casting numbers are 3849852 and I know what these mean. The stamped numbers that I'm finding it hard to get info on.
Thanks.

 

[1st Vette]

Good day.
I have just acquired a 283 block. The numbers 'stamped on the machined boss are 77 6471759 , see below, Can anyone direct me to a web site where I can determine what these numbers mean.
I've looked but run into a dead end.
The block casting numbers are 3849852 and I know what these mean. The stamped numbers that I'm finding it hard to get info on.
Thanks.View attachment 126108

Try this.

Mortec - Chevy Small-Block Casting Numbers, Engine Codes and more

To decode the assembly plant code in a GM engine ID:

1. Locate the engine ID code on the engine block. For V8 engines, it's typically stamped on a pad just forward of the passenger side cylinder head.
2. The assembly plant code is the first character in the engine ID code.
3. Use this reference chart to identify the plant:

• F = Flint (Motor)
• H = Hydramatic
• K = St. Catherines, Ontario (McKinnon Industries Canada)
• M = GM of Mexico
• S = Saginaw Service
• T = Tonawanda
• V = Flint (Engine)

For example, if your engine ID code starts with "T", it means the engine was manufactured at the Tonawanda plant.Remember that the full engine ID code typically consists of 8 digits in this formatAssembly plant code)(Month)(Day)(Engine suffix code)For instance, in the code "T0830CTY":

• T = Tonawanda plant
• 08 = August
• 30 = 30th day
• CTY = Engine suffix code (which provides more specific information about the engine)

By decoding the assembly plant code, you can determine where your GM engine was originally manufactured.

 

[roadcracks]

Try this.

Mortec - Chevy Small-Block Casting Numbers, Engine Codes and more

To decode the assembly plant code in a GM engine ID:

1. Locate the engine ID code on the engine block. For V8 engines, it's typically stamped on a pad just forward of the passenger side cylinder head.
2. The assembly plant code is the first character in the engine ID code.
3. Use this reference chart to identify the plant:

• F = Flint (Motor)
• H = Hydramatic
• K = St. Catherines, Ontario (McKinnon Industries Canada)
• M = GM of Mexico
• S = Saginaw Service
• T = Tonawanda
• V = Flint (Engine)

For example, if your engine ID code starts with "T", it means the engine was manufactured at the Tonawanda plant.Remember that the full engine ID code typically consists of 8 digits in this formatAssembly plant code)(Month)(Day)(Engine suffix code)For instance, in the code "T0830CTY":

• T = Tonawanda plant
• 08 = August
• 30 = 30th day
• CTY = Engine suffix code (which provides more specific information about the engine)

By decoding the assembly plant code, you can determine where your GM engine was originally manufactured.

Thanks for the info. Doesn't seem to apply to these old blocks. There are only numbers on this block no letters,

• as stamped on a machined pad just forward of the passenger side cylinder head.

 

[1st Vette]

Thanks for the info. Doesn't seem to apply to these old blocks. There are only numbers on this block no letters,

• as stamped on a machined pad just forward of the passenger side cylinder head.

I contacted a GM department , quite a few years ago though , and was able to get all the info on a Pontiac 350 from the casting number but unfortunately can’t remember exactly how I found the contact. Perhaps call GM and ask if they can point you in the right direction. They will no doubt have the info on every engine they have produced in a database somewhere on their servers. The casting number was on the back right side of the engine facing the firewall. On the block. Maybe there is another number that you have yet to see . Hard to see with the engine in the vehicle. If I recall I used a mirror to see it after cleaning all the dirt and old oil off . Good luck with it.

 

[Murray20c8]

If it's from a corvette, then contact the museum.

 

[Blu427]

Good day.
I have just acquired a 283 block. The numbers 'stamped on the machined boss are 77 6471759 , see below, Can anyone direct me to a web site where I can determine what these numbers mean.
I've looked but run into a dead end.
The block casting numbers are 3849852 and I know what these mean. The stamped numbers that I'm finding it hard to get info on.
Thanks.View attachment 126108

It is an unusual number and would leave me to believe it is a dealer installed replacement engine.
This was common in the 60s and 70s when an engine was replaced with a new one from the factory
and it wasn't associated with a built factory car.

 

[roadcracks]

I contacted a GM department , quite a few years ago though , and was able to get all the info on a Pontiac 350 from the casting number but unfortunately can’t remember exactly how I found the contact. Perhaps call GM and ask if they can point you in the right direction. They will no doubt have the info on every engine they have produced in a database somewhere on their servers. The casting number was on the back right side of the engine facing the firewall. On the block. Maybe there is another number that you have yet to see . Hard to see with the engine in the vehicle. If I recall I used a mirror to see it after cleaning all the dirt and old oil off . Good luck with it.

Thanks, I'll try your advice. Regards

 

[roadcracks]

It is an unusual number and would leave me to believe it is a dealer installed replacement engine.
This was common in the 60s and 70s when an engine was replaced with a new one from the factory
and it wasn't associated with a built factory car.

That's an interesting thought. I called a local engine shop and they believe it is a cast in Canada block. Thanks for your help. Regards