Posted 23 January 2005 - 06:28 PM
I don't think you fully understand head tuning. As Pavel said, stages mean nothing really. They are just a quick reference of how much development work has been done to a head from standard. Most companies would quote stage 5 as their highest development head, but that doesn't mean that all stage 5 heads have had the same things done to them. A stage 2 head from most places should have some porting done to it along with larger inlets, and the amount of work done to each aspect of the head (porting, valve sizes, throat shapes, combustion chamber shape etc) will increase as you go up the stages. As Guessworks said, if you can get a head which is made from a better casting in the first place then you won't need to have so much done to it.