going to have a caht with bloke who has got my head at min about porting whats a good size for exhaust ports to be ported to?

 

Roosie, head porting really isn't that simple. You can't just specify a size and they open the ports out to that. It is a manual labour task and is down to the individual preference of the person carrying out the work as to what they believe will work best.

 

Depends on spec most big power cars are about 25mm well i have just finished mine and thats what size ball now goes down ports what a piss boring job but they have to be done by hand because of curvature in port

 

I think they need to be 4 1/2" each!!
tabetha