Antony - best you come & have a look at the 600 heads & the (albeit knackered) 620 ones that AK has.
Ali was a bit amazed when he saw then last night too!
When they are side by side, you can see the big difference on the inlet & outlet
Porting (Alan thinks) is the only thing that will make them come up to the same performance level - and we arent allowed to do that
C, rapidly becoming an expert in this field.....
