Help Decoding a Engine Number
 

I was told that a car I recently acquired had all correct 930 parts. Everything underneath looks correct, I can see the turbo, waste gate, all correct factory 930 exhaust and parts ect. But the engine number is puzzling. If I am decoding it correctly 64F03953 comes back as a Japan market regular Carrera motor, but the sequential engine number seems too high since according to my red book, it shows only 361 built from Aug 84 to July 85 for the F model year. Its a 930/21 motor. I find it kind of odd that a Japan market motor would make it over into the US. Secondary my question is how much internal difference is there between a 1985 930/66 motor and a 930/21 motor if all the manifolds, turbo, and exhaust were bolted onto an original non-turbo motor? Any expertise would be appreciated...

In the How to rebuild and Modified Porsche 911 Engine the list for Carrera 1985:

63F00001 - 0n as Type 930/20 Row

64F00001 - On as Type 930/21 USA

63F10001 - On as Type 930/26 Switzerland/Sweden/Austria

67F00001 - On as Type 930/66 Turbo Row & Canada

If you look at your Red book there is actually another 4951 US cars produced using 64F..... Type 930/21, just below 361 from Japan

So your is a US car that was turboed by a PO

Eh? "64F0" would be a 930/21 right? It would need a "7" in the second digit to be a 930/66 for RoW & Canada - and there was no US turbo that year.

He has a US Carrera car, fitted with a 930/21, that someone put a Turbo on it.

1985 engine number help
 

Hi Guys, I am brand new to Porsche (and love it) I am looking for any help on my engine number ?
67F00990
Car is a 1985 Factory slantnose 930. ZZZ VIN.

Any help is appreciated, thanks!