Exhaust valve ceramic coating or deposits?

[Brett Dikeman]

On Mar 11, 2006, at 7:50 PM, Kurt Deschler wrote:

> I have the head off of my 5ktq to re-mount the EM and I am lapping the
> valves while it is off. There is a hard white substance on the exhaust
> valves. I would like to know if this is ceramic coating that should be
> kept or some kind of deposit that should be removed. When I did my  
> 200tq,
> I left it on because I wasn't sure. Anyone know for sure?

Nope- not a coating.

If you have the head off and plan on keeping the car for a while,  
consider removing the EM and downpipe and having the inside cleaned 
+ceramic-coated.  Underhood temperatures will be cut substantially.   
Some folks do the turbo exhaust side housing as well, I think.

Brett