Contour Enthusiasts Group Archives Forums Modifications 3.0L Duratec 3.0 with svt heads

One thing Warmonger, intake valves are not designed for the much higher heat of the exhaust gas port. Swapping in the intake valves to the exhaust side will get you great performance for a while, but get you a set of burnt valves too. Better idea would be to spec out a custom set of valves or swap in another set of larger exhaust valves from another car.