Help - How to identify cylinder year/model type?

[tom1394racing]

I am trying to identify a a variety of different heads for model type and year (ie P/N).

Is there some way to link the casting number (cast into the head) to the year and model of the head? I have the Porsche PET that allows me to link P/N to the year/model. Can I do this without having to measure the ports and valve sizes on each head?

[Early_S_Man]

Tom,

I have never seen a cross-reference such as you describe, though have wondered many times if such a list exists. The pictures in BA's handbook are incomplete as far as the full range of engine versions, but is just about the only reference I know of ...

The real problem is that the raw casting numbers are too different from the parts system numbers -- differing in the hundreds digit of the middle trio, either for the bare heads, or for the assembled heads with valves!

[tom1394racing]

Warren

Here's a link to a good cross reference table:

http://www.carquip.com/parts/911/engines/cyltbl/index.aspp

Henry Schmidt says that there is a date stamp that will tell model year and narrow the choices down, but that it is necessary to measure the ports and valves to pin down the model.

[911quest]

There is also one started on the early S registry

[BK911]

I thought S heads had a 305 in the casting number. ????