Type 901/xx Engine Build #'s

[davep]

Thanks Richard. It appears that the beginning of 1968 engine types began about 9200. It would be nice to nail that down better.

[C.Plavan]

Here are the 3 early aluminum cases in my garage at the moment. I can check two more later.

901/01
968
#901068

901/05
5710
#909452

901/05
4101
#907248

[John Straub]

Dave,

Here are two: 901/01
1177
9011277

901/14 (Mag.)
12510
3280758

John

[parced@telia.co]

I'm building my 911/83 with 3.0 Liters RSR P/C´s (small split) on an really old case, way cool I think. The case came from a 72S that had all the racing stuff from a crashed 2.8 RSR. A RSR that´s pappers later were sold and "voala" a real, and lost, 2.8 RSR suddenly came out on the market a few years later....

It seems have been cast December 1964 according to the cast dial.
901/01
712
900812 (John was right, I zoomed in on the number...)

Does this not suggest that this is the 712 case ever built!

[304065]

Pär,

Yes, that is a very early case. Can you post a photo of the casting dates on the end? Should be a 64 in a circle. The "300812" shouldn't that be a "900812"? And the 712 is the engine series number, which accounts for the first 100 engines being used for testing and prototypes, we've heard that before.

Here's a photo of my engine case showing the engine number and the casting number below the crankshaft bore in a circle. Also there's one under the distributor mount stud.

[davep]

Pär, yes it is the 712th production engine built. Can you tell me the number on top of the case (on both halves) that shows the case is a matching set. That number should be very interesting. The halves were machined as a set and marked (numbered) to ensure they were kept together. So from the casting operation to the machining operation, then to assembly. The case half numbers are the first numbers stamped into the case. They would be on the prototype cases as well, so the numbers should be consistently higher than the build # I'd guess.

John, what are all the #'s on your case there? Why is the serial number on the end instead of the side of the support? Is this an early arrangement? When did it change?

[Bobs 67S]

I think the engine serial numbers have always faced the rear of the engine.

The first engine installed in a production car did have a different shaped rib. The numbers run from top to bottom, as seen here in the 1965 Owners manual.

[parced@telia.co]

My:
901/01
712
900812 (sorry, need new reading glasses. It was a 9 and not 3.)
has 963 stamped on the halves, the "pairing number".

[davep]

You are correct Bob, at least for the most part. I guess I was just remembering these recent photos:

[davep]

So it appears things changed in 1968 or so regarding the position of the engine serial #. Could people please check and report back on this detail.

I have added the case "pairing number" data I have. If you are able to provide this data, please do so.