PRY4SNO wrote:Upgrading the exhaust valves is almost a no brainer. My head was basically new (10,000 km) but Hank convinced me that $160 on some Ferrea valves was cheap insurance, considering the alternative costs associated with dropping a valve. During that discussion I asked him about the valve sizing and his take was that for the power range I'm shooting for it's best to keep the velocity high and stay stock size. I think you go up when you cross the gt30/gt35 threshold.
Interesting. When do you risk dropping a valve? Certain power range or is there something with the stock sodium filled valves?
It looks pretty affordable to do the Ferrea 6000 but then do I need springs and retainers too , or can I just do the valves, guides and seals?



























