Biger Valves

[Albert]

I'm just one step ahead of modifying size of the valves in my head. I can use new ones but I would like to hear form You about it.

Do I kneed bigger valves (intake and exodus) ?
If Yes how much bigger they should be ?
How much should I take form the channels ?

I’m planning 500-550HP for the drag racing. At the moment I have 450HP but the head is unattached except that is was renewed last winter.

Thank's for the help

Albert

[Audi Parts Guru]

Albert,

I would personally spend the money on getting the ports improved. Do you know a good compqny in Poland with a flow bench ?