Holden 6 cylinder 12 port head dividers, these cast aluminum port dividers are used when you want to convert a 9 port cylinder head to a 12 port. These are an old school modification that was used mainly when triple weber side draft carbs were used on Holden 6 cylinders.
These pre shaped aluminium port dividers for the DIY cylinder head guys.
This pic shows side, top and bottom of the dividers that are fitted to a 9 port holden cylinder head to convert to 12 port.
Length around 187mm long
Entry width 17mm
Width before short turn 22mm
Port height 42mm