Help - How to identify cylinder year/model type?
 

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?

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!

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.

There is also one started on the early S registry

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