: ? for Bbob re: engine designations



Ranger
12-21-04, 10:41 PM
In an earlier post you mentioned
K=9=L37=300 HP
M=Y=LD8=275 HP
Why three different designations for the same engine?

danbuc
12-21-04, 10:59 PM
I haven't seen the K or the M before. The Y and 9 are used to to designate the engine in the vin # while L37 and LD8 are used to identify the engine itself. In a sense, if you were looking at a Seville with the badges removed, you could tell if it was an STS or an SLS simply by looking at the vin# to see if it was a Y or a 9. The same applies to the engines as well. Say you wanted to buy a northstar, but the person selling it didn't know which one it was. You can tell by looking for L37 or LD8 which would probably be somehwere on the engine block.

BeelzeBob
12-23-04, 12:16 AM
In an earlier post you mentioned
K=9=L37=300 HP
M=Y=LD8=275 HP
Why three different designations for the same engine?


There are others, too....LOL....not just three.

The L37 and LD8 are called the RPO or regular production option code.

The alpha/numeric in the VIN happens to be what it is due to restrictions of what you can use in the VIN and what characters were already spoken for.

The "K" and "M" is an in process code that is put on a little paper sticker on the front of the engine and the rear so the guy driving the forklift in the plant can identify what type of engines are in the rack he is unloading from a semi trailer in near darkness....LOL. The engines are built and racked for shipment to the car plants and do not get the VIN on them until they are assigned to a car on the assembly line. The plant needs a ready reference to identify them by. GM uses a three digit alpha code sticker on all engines to identify them. The model year is represented, the type of engine (K or M) and the running change level of the engine. This character is incremented everytime an engine change is implemented during the productin model year as often the engine change has to correlate to a change in the car plant, too. This gives the plant a reference to track the change into the car plant and to reference the VIN break point by. "K" and "M" just happened to the the alpha characters available within the GM system when the Northstar started production.

The M and K is purely an inplant id....but the sticker usually hangs onto the engine in the field so it is a quick way to id an engine type if the tag is still on the engine.