You dont really need to replace the valves.. nothing wrong with them really.. its the valve retainers that have the problem. And if you buy a set of valve retainers for the KLDE (ford Probe GT V6) those are much beefier and wont have any issues. Plus they are cheap.. usually less than $25. Though since you will have the heads off most likely to do this job.. a valve job wouldnt be a bad idea.. just depends on how much cash you have and how anal you are If the engine is going to be severely abused.. maybe try and find sodium filled exaust valves. But they wont be cheap.I have heard it is best to swap out the retainers and valves before installing the ZE, to get a better life out of it, but what Valves and Retainers do I use?
Tunes67