Carrera 3.2 head vs 930 3.3 what is difference

[mgro1959]

Can anybody tell me the difference between the Carrera 3.2 head and the 930 turbo 3.3. I would assume the valve size is difference maybe but have done no research. I want to twin plug my 930 engine but am looking at options available. Thanks rob

[Steve@Rennsport]

The main differences are port size and the alloys used for Turbo heads.

If you have a 930, I would machine your current heads for twin-ignition.

[mgro1959]

Thanks Steve; That narrows the scope of the program. Find some 930 heads reasonably Thanks Rob