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Old June 13th, 2009, 02:14 PM   #1 (permalink)
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Photos of Casting Number Locations, Engines

There have been several people new to the world of Oldsmobiles asking how to key out their block. More experienced guys have described where to look, but I thought of the statement a picture is worth a thousand words. So... here are a few pictures of engine block casting numbers and vin numbers plus larger views of how to find them. You'll have to ignore the paint color on a couple of them. I would NOT paint my engines chebby orange or Ferd blue but I have purchased a couple that were already painted and I've not got around to repainting them So don't pay any attention to the colors

Click the image to open in full size.
1977 350 engine casting number. Note the large "3B" at the end

Click the image to open in full size.
vin number stamped on a 1977 350 block

Click the image to open in full size.
The location of a motor block casting number, this one a 1967 425

Click the image to open in full size.
Here's a closeup of the 1967 425 casting number. Note the large "D" at the end

Click the image to open in full size.
Here's the vin pad on the 1967 425. There is no vin stamped in it as this didn't begin until 1968, but this is an idea where it's located on the 1968 and newer.

Click the image to open in full size.
Overview of the location for casting numbers on a 1968 350

Click the image to open in full size.
This is a 1968 350 engine casting number. Note the large 2 after the other numbers.

Click the image to open in full size.
Here's the vin location on a 1971 350 engine

Click the image to open in full size.
This is a 1965 330, it has a larger 1 in front of the other numbers not one at the end.

Click the image to open in full size.
The 1967 330 had a large number 3 at the end.
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Last edited by 2blu442; June 13th, 2009 at 02:17 PM.
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Old January 18th, 2010, 02:36 PM   #2 (permalink)
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Engine Number on a 1965 330CID jetstar 88

Quote:
Originally Posted by 2blu442 View Post
There have been several people new to the world of Oldsmobiles asking how to key out their block. More experienced guys have described where to look, but I thought of the statement a picture is worth a thousand words. So... here are a few pictures of engine block casting numbers and vin numbers plus larger views of how to find them. You'll have to ignore the paint color on a couple of them. I would NOT paint my engines chebby orange or Ferd blue but I have purchased a couple that were already painted and I've not got around to repainting them So don't pay any attention to the colors


Great work! I've been trying to find the engine number (not the casting) on my 1965 330CID motor. Any ideas?

Thanks, Ddbord

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Click the image to open in full size.
1977 350 engine casting number. Note the large "3B" at the end

Click the image to open in full size.
vin number stamped on a 1977 350 block

Click the image to open in full size.
The location of a motor block casting number, this one a 1967 425

Click the image to open in full size.
Here's a closeup of the 1967 425 casting number. Note the large "D" at the end

Click the image to open in full size.
Here's the vin pad on the 1967 425. There is no vin stamped in it as this didn't begin until 1968, but this is an idea where it's located on the 1968 and newer.

Click the image to open in full size.
Overview of the location for casting numbers on a 1968 350

Click the image to open in full size.
This is a 1968 350 engine casting number. Note the large 2 after the other numbers.

Click the image to open in full size.
Here's the vin location on a 1971 350 engine

Click the image to open in full size.
This is a 1965 330, it has a larger 1 in front of the other numbers not one at the end.

Click the image to open in full size.
The 1967 330 had a large number 3 at the end.
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Drove Ninety Eight's for 22 Years!
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Old January 18th, 2010, 04:04 PM   #3 (permalink)
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Ddbord, welcome to the site! the 1965-67 engines (maybe 1964 too?) have the application number stamped into the front of the passengerside head. This will be different from the vin number or anything on the trim tag, but if you know the letter codes before or after the number you can key out what the motor originally came in. Here's some examples.


Click the image to open in full size.
1966 Cutlass 330 but I can't read the letter stamped before the numbers
Click the image to open in full size.



Click the image to open in full size.
1967 Olds 98 425, note the large R before the numbers
Click the image to open in full size.



Click the image to open in full size.
1965 442 400 engine, note the letter V before the numbers


So these early cars are a little more difficult to say numbers matching as there's no vin number on them. What you can do is look at the casting dates for different parts of the motor and the production date of the car to see if they're reasonabley close together.
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Old January 18th, 2010, 05:15 PM   #4 (permalink)
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Great picture John this is great for clearing up the questions.\

Thanks
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Old January 19th, 2010, 10:29 AM   #5 (permalink)
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Quote:
Originally Posted by 2blu442 View Post
Ddbord, welcome to the site! the 1965-67 engines (maybe 1964 too?) have the application number stamped into the front of the passengerside head. This will be different from the vin number or anything on the trim tag, but if you know the letter codes before or after the number you can key out what the motor originally came in. Here's some examples.


Thanks for the info! I'll try and find the number on the front of the passenger-side head. Where do I find the letter codes?

Ddbord



Click the image to open in full size.
1966 Cutlass 330 but I can't read the letter stamped before the numbers
Click the image to open in full size.



Click the image to open in full size.
1967 Olds 98 425, note the large R before the numbers
Click the image to open in full size.



Click the image to open in full size.
1965 442 400 engine, note the letter V before the numbers


So these early cars are a little more difficult to say numbers matching as there's no vin number on them. What you can do is look at the casting dates for different parts of the motor and the production date of the car to see if they're reasonabley close together.
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Drove Ninety Eight's for 22 Years!
My 1965 "98 LS" Was Gold with a Black Vinyl Roof....
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Old January 19th, 2010, 10:49 AM   #6 (permalink)
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Thanks great pics
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Old January 19th, 2010, 11:02 AM   #7 (permalink)
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Quote:
Originally Posted by 2blu442 View Post
So these early cars are a little more difficult to say numbers matching as there's no vin number on them. What you can do is look at the casting dates for different parts of the motor and the production date of the car to see if they're reasonabley close together.
Called the "engine unit number", it can be found on the Protect-O-Plate and the build sheet, thus be verified as original. The head, at least........
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Old January 19th, 2010, 12:46 PM   #8 (permalink)
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Helpful info for newcomers and oldsters alike.
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Old January 19th, 2010, 01:55 PM   #9 (permalink)
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Protect-O-Plate

Quote:
Originally Posted by wmachine View Post
Called the "engine unit number", it can be found on the Protect-O-Plate and the build sheet, thus be verified as original. The head, at least........
I bought this car this from from the original owner. The car had the original NY plates from 1965. In NY you can use the orig. plates on an antique. I got the original title from the owner. Car never had a lien. I got the original glove box manual, but not the GM top manual that came with convertibles.

There was no Protect-O-Plate and I don't know anything about a build sheet!

Where would they have put the build sheet?

I found the numbers on the passenger-side head end. They look like
164 029.

Thanks for your help!
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Drove Ninety Eight's for 22 Years!
My 1965 "98 LS" Was Gold with a Black Vinyl Roof....
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1996 Buick Park Avenue - Marilyn's ride 72M Miles Like New!

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Old January 19th, 2010, 06:21 PM   #10 (permalink)
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Doug, the letter I mentioned is stamped with the numbers. The 425 stamp is easy to see, it's R255893 I believe the letter "R" will key out the application it was originally put in.

Kurt, thank you for mentioning the Protect-O-Plate, I'd forgotten about that!

The build sheets were left in the car during the assembly. They were to tell the assembly line workers what to put in the cars as they went down the line. You have to remove parts of the interior to find them, so if your car is original and in good shape you may not want to do that You can do a search on this site for "build sheet" and find threads that discuss it in depth.

Buying a 1965 model from the original owner is a pretty cool thing. Not many of those are left. Congrats on getting the car! If you have more questions about other topics it may be best to create a new thread with a title of your topic. More people who can share their knowledge can find your threads then. John
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Old January 20th, 2010, 03:38 PM   #11 (permalink)
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Red face Build Sheet

Quote:
Originally Posted by 2blu442 View Post
Doug, the letter I mentioned is stamped with the numbers. The 425 stamp is easy to see, it's R255893 I believe the letter "R" will key out the application it was originally put in.

Kurt, thank you for mentioning the Protect-O-Plate, I'd forgotten about that!

The build sheets were left in the car during the assembly. They were to tell the assembly line workers what to put in the cars as they went down the line. You have to remove parts of the interior to find them, so if your car is original and in good shape you may not want to do that You can do a search on this site for "build sheet" and find threads that discuss it in depth.

Buying a 1965 model from the original owner is a pretty cool thing. Not many of those are left. Congrats on getting the car! If you have more questions about other topics it may be best to create a new thread with a title of your topic. More people who can share their knowledge can find your threads then. John

Thanks for your advice! I'm new to this forum, although I joined it in September. Just getting into checking out the car!

The man I bought it from drove it from Buffalo, NY to Rutherfordton (pronounced "Rufton") North Carolina, about 20 miles from my home!

Said he went 80 all the way! Must have taken him 10 minutes to get it up to 80 because the carb pump and the vacuum advance did not work!

They work now and the machine really goes!

--Ddbord
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1965 Jetstar 88-Built in Lansing, 1st Week in May

.
Drove Ninety Eight's for 22 Years!
My 1965 "98 LS" Was Gold with a Black Vinyl Roof....
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2006 Dodge Grand Caravan SXT - Go to the Home Depot!
1996 Buick Park Avenue - Marilyn's ride 72M Miles Like New!

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Old October 11th, 2010, 12:10 PM   #12 (permalink)
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1969 oldsmoble

hi could you tell me whit year motor i have my numbers are 395558 big number 2 but i have number 6 heads i have been told it a 1970 becouse of the heads i pulled the motor apart the heads still have the metal gaset
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Old May 3rd, 2013, 06:21 AM   #13 (permalink)
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How about the '71 and '72 455's? any idea where the engine number is?
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Old May 3rd, 2013, 06:44 AM   #14 (permalink)
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Drivers side front of engine under the head just like johns second pic showing the 77 350

It may be tough to see w accessories on the engine
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Old May 8th, 2013, 07:01 PM   #15 (permalink)
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How about the '71 and '72 455's? any idea where the engine number is?
1968 thru oh about 1976-77 or so at least, the _ENGINE UNIT NUMBER_ is stamped into the Oil Fill Tube. 7 digits, first one indicates model year

Example:
8100123 for a 1968 engine
9100123 for a 1969 engine
0101442 for a 1970 engine [I would pay for a tube stamped thusly, for a curiosity!]

etc.
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Old May 9th, 2013, 04:49 AM   #16 (permalink)
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As Chris correctly points out, for 1968-up motors the Engine Unit Number is on the oil fill tube. The VIN derivative is stamped on the driver's side of the block. The first digit of the engine unit number is the model year (of the oil fill tube, at least), the second digit of the VIN derivative is the model year (of the block). No other pieces of the motor have a specific year stamp (though some parts, like the heads, may have year-specific casting numbers).
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Old May 9th, 2013, 02:40 PM   #17 (permalink)
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Quote:
Originally Posted by joe_padavano View Post
No other pieces of the motor have a specific year stamp.....
True for most major castings, but many engine parts do have date codes which include the year: Carb, distributor, alternator, air cleaner housing, OAI adapter, oil filter adapter, etc. Heck, even the aluminum intake manifolds' date code included the year.
(I know that you already knew this, Joe, just wanted to clarify for others.)
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Old May 9th, 2013, 02:40 PM
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