Not Ranked
I'm far for an expert but just last week I had my aluminum heads rebuilt with new valves, guides, etc. The machinist commented on the valves as they had pits in them and stated it was due to water getting into the cylinder. I don't know how this occurred- whether intentional by the previous owner or via a internal leak but in either case, the valves showed damage. One might want to rethink about this procedure your suggesting.
By the way, the car did not emit any white smoke prior to me tearing down the engine which leads me to think there was no internal water leak.
Mike
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