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One of the issues, that these motors are dropping exhaust valves at high rpms. Some people in South Africa that race these motors have encountered this problem.
Here is the reason why:
The exhaust valves in the FE3 rotates while the engine is running. Mazda did this to prevent burning the exhaust valves. So they allowed the exhaust valves to rotate on the valve keepers. This is a good idea, but can be a bad thing.
The reason it can be a bad thing, because this causes alot of stress on the tip of the valve stem, where the valve keepers holds the valve to the retainer.
For example... If you take a FE3 exhaust valve, and the keepers and the retainer in your hand. And place the retainer and the keepers on the top of the valve, and pull the retainer with one hand, and pull the bottom of the valve with your other hand. You can rotate the valve, no matter how much pressure, or how much you pull. The keepers have a special groove on it, that does not allow the keepers to lock the exhaust valves in place, it allows it to rotate.
Now the FE3 intake valves have keepers that holds the valve in place, and it does not rotate at all. These valves don't drop, because it's no pressure on the tip of the valve.
So to fix the problem, you will need to place the intake valve keepers onto the exhaust valves, and throw away the exhaust valve keepers. You can get these intake valve keepers at a local KIA dealer.
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When upgrading to the KIA keepers on the exhaust side you need to order 16 keepers or all that you will get is 8 halves.
Also VR6 spring from VW work on the FE3 as upgraded valave springs.
The part number for the 1998 VR6 springs is: 021-109-623-P
The springs are for a 1998 Volkswagon GTI VR6.
You order 16 outer valve springs for VR6.
(Thanks FallGuy, Richey89Turbo and 89tpgt for the info)
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