Thanks for your reply.
The 3-digit case are all match ( number 750).
Yes the engine is the matching number for my car.
The transmission is 5462 but I don't know if is matching number because, in my COA, there is not the number.
James Davies wrote:
Thanks for sharing Enry. Interesting! And the 3-digit case matching numbers all match? That would be the 3-digit number on top of the cam gear cover matching the two 3-digit numbers on the two case halves, located on the rear bolt boss behind the fan shroud? All 3 case numbers should match, as this indicates the 3 pieces were machined together at the Porsche factory.
The reason I ask is that the internal number (8139) is a bit early compared the engine number (34576). I say this because engine with internal number 8195 is numbered 34406, which fits into the overall trend. It's possible that is just how Porsche did it, but only Porsche has this information to confirm. See plot below to see how much of an outlier your engine number is relative to the internal number. Interpolating the rest of the data, engine 34576 should have an internal number close to 8457, over 300 engines off, which represents a over a month of Porsche production.
Anyway, your case has that extra star, which is unusual, but everything else looks very normal. Is this the matching numbers engine to your car?
I ask about these numbers because at least for the 2-piece pre-A engines, a significant fraction of them in cars today are forged - made up from later VW engine blocks that have been restamped, or Porsche engines that have had the number changed. This was and is common, as VW engine blocks are common. Much less common on the early 3-piece engines like yours as these blocks are rare.