VIN Conundrum, WTH? Options

[Artfrombama]

According to the engine code in my VIN my car is equipped with the 2L engine. No evidence that anything but a 1.8L engine was in the car.

4742910621

47 = Porsche 914 Type Designation
4 = Model Year 1974
29 = Engine Code / Chassis Variant (2.0L Fuel-Injected Flat-4)
10621 = Sequential Production Serial Number

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[sburns1967]

ChatGTP:

VIN/chassis number 4742910621 decodes quite cleanly as a 1974 Porsche 914/4.
VIN breakdown 4742910621

Digits Meaning
47 Porsche 914/4 — four-cylinder model
4 1974 model year
29 914/4 variant/index code
10621 Sequential chassis/production number

So:
4742910621 = 1974 Porsche 914/4, chassis #10,621

The number falls squarely within the documented 1974 914/4 chassis range of 4742900001–4742921370. Wikipedia

What the VIN does—and doesn't—tell us

Importantly, the VIN alone does not distinguish a 1974 1.8L from a 2.0L. Both 1974 engines used the same 47429xxxx VIN sequence. The factory engine-number ranges were:

- 1.8L: EC 0000001–EC 0037551
- 2.0L: GA 0006766–GA 0015021 Stoddard

Therefore, if this is the 1973/74 2.0L 914 you've been working on, we'd need the engine number to determine whether the engine is original to the car.

One particularly interesting point

Your VIN 4742910621 is substantially earlier than the known 1974 914 Limited Edition VIN range of 4742914348–4742916764. So it is not within the factory Can-Am/Limited Edition VIN range. Rennlist

Also, the VIN's sequential number does not give us the exact build date. For that, the much more useful number is the Karmann production/chassis number on the small Karmann plate. That number can be decoded to the production week, day, and sequence within that week. Rennlist

If you give me the Karmann production number from your 914, I can decode the exact production date and then we can determine whether your car is an early/mid/late 1974 and which factory configuration it should have had.