dewcrazzy

What do these numbers stand for on the drivers side of the block under the heads. 32m243584?

Also how do you check to see if your car is numbers matching?

Thanks

wls559

Engine #, if it is a numbers matching car the last six of that number should match the last six of your vin.

Bill

wls559

Oh yeh, the 3= Oldsmobile Division, the 2= 1972, and the M= Lansing

Bill

joe_padavano

Actually, that is a VIN derivative, and to be "numbers matching" it has to MATCH the VIN. The first character needs to match the first character of the VIN and the last eight characters need to match the last eight of the VIN. Characters two through five of the VIN are not reproduced on the VIN derivative, which is why it is also called a partial VIN. The trans case and frame also have VIN derivative stamps.

The engine number (actually, the engine unit number) is the number stamped on the oil fill tube and is not related to this VIN derivative.

wls559

I see your point Joe, my terminology is a little off but I understood it! Does that count; LOL! Horseshoes..... Hand grenades; anybody?

Bill

joe_padavano

Not a criticism, just trying to avoid "truth decay".

Engines from that vintage had both an engine unit number and a VIN derivative, and they are not the same thing.

BackInTheGame

Joe, this is the first time I've noticed the use of the term "engine unit number" as opposed to "engine." You note that the number on the fill tube is not related to the VIN derivative. What is the engine unit number related to? Is that like a serial number for the engine itself? I notice on my own OEM 400 the number on the fill tube is different.

joe_padavano

Yes, that's exactly what it is, an engine serial number. Prior to the 1968 model year, the engine and trans each got their own unit numbers, which were recorded on the Protect-O-Plate and thus tied to the VIN that way. From 1968-on, the unit numbers were no longer recorded on the P-O-P. This is why the only way to have a numbers-matching pre-1968 car is to have the P-O-P. Here's an example of a 1965 P-O-P that shows the engine and trans unit numbers. Note that the engine unit number format changed with the 1968 model year.