Hmm.
I don't wanna be that guy, but I guess it's gonna be very tough to find the original engine to your friend's car, given that it probably got taken out long time ago.
Chances are it's unobtainable and will never surface again.
I've got the same issue with my engine not being original to the car - at some point in the past the original engine got taken out and replaced by a factory replacement (no nr. stamped on the case).
To this point I haven't even bothered looking for the original engine, thinking it's probably pretty pointless.
But definitely good luck witch the hunt for your friend's original engine!
Keep us posted how it goes - if successful, I might go ahead and give it a try myself!
He's looking for the same block that came with the car that should have the same VIN stamped on the block. I am not an e9 expert, but I know this is the case for 2002's and e3's so I would assume it should also match on the e9. Somebody please correct me if I am wrong. This brings up a good subject. This is going to become more and more important for the older BMW's to have matching engine numbers. Porsche has known this for a long time and have a "Lost and Found" thread on the Early 911S Registry. It would probably be a good idea to get a sticky on here to. You would be amazed how motors will find their chassis. It will pop right up in a search, many a happy Porsche owner has been reunited with the original motor/chassis vise versa. I wouldn't have believed it myself had I not read all the success stories.... Something to think about Administrators.... Maybe do one for e3 too? Mine is matching number so I am lucky but not everyone is in the same boat and it really makes a HUGE difference if you ever sell the car. That's in Porsche 911 land, I don't think so much in BMW land.....yet.....you'll see. Start your search now, it can't hurt.
It seems to me that he's after a year correct block, not the actual engine that came with the car originally. Although if he was lucky enough to locate the actual matching number block it would definitely be the dream scenario.
The # provided is, I believe, the part # for the block.
The stamped VIN would probably be a 22xxxxx or a 43xxxxx number depending on '73 or '74.
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