04-10-07, 05:53 PM
Hey guys, sorry if this has been covered in a previous thread, but where in the hell is the serial # on a N* motor? Must be buried under somethin. Reason I ask is I have a motor that I think was out of a 95-96 Eldorado and want to research it further. Once I have the number is there a way to decode it? Is it a 275 or 300 hp version? Then how would I trace it to the vin of the original car? I want to run a carfax on that car and find out if any smoke was blown up my skirt about this engine. Thanks for any help.
under rear cylinder bank (or right cylinder bank if you are oriented the same way the engine is).
behind Rear headers and Transmission
08-03-09, 07:26 PM
The Northstar has a machined pad on the block, just under the right (rear) cylinder head at the "front" of the block, right around the corner from the serpentine belt. The engraved/stamped number on that pad is a "VIN derivative" of the original car number. A GM dealer should be able to decipher the meaning. MAYBE there's still a sticker on the front of the right (rear) cam cover. A CARFAX will tell you basic registration changes and maybe emissions tests - because that's a voluntary reporting database, there's not a lot of info on most cars. IF a dealer can find the whole VIN, ask them to run a GM VIS check - all GM warranty, recall, some service work on that car.
The one on my 98 motor I bought had LD37 and the last 8 characters (which is the year built, assembly plant, and the 6 digits of the sequential build number) of the cars VIN under the LD37 engraved into the pad. The pad is on the rear of the block next to cylinder 1 just above the oil pan flange as described above, its about 2" long by 1/2" tall. Looked like the numbers were done with an engraving tool instead of a stamp like they used to do in the past. Must have some kind of automatic engraver on the assembly line that does it in one quick pass.