Posted: Fri Sep 11, 2009 5:05 pmHi guys I thought it might be handy to start a thread where we can post sections of different cylinder heads for research and general knowledge. These are Holden V8 factory castings, notice the vast improvement in casting finish and port shapes/angles from the early RED motor carburretor heads (top) ,to the later BLACK motor EFI heads (bottom)!! :;):