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Ok, update ive messed around with it for hours and hours and found serveral problems all secondery to the water issue..
dist cap oily, plug gap too small i mean tiny, renix voltages off, then no petrol.
fixed all the above. got the engine as dry as i could splutterd it into life, then died and splutterd and died then used my best friend redex while it was alive ran it for about anhour, anoying everyone i might add.
How exactly would you kill a valve? Rods are what you'll bend when you hydrolock an engine.
If it ever happens again, whip the plugs out, and spin it over on the starter until it's all out. It shouldn't take long. With the plugs out, there should be no issue. Open the throttle if the little scrotes have filled the intake. It's a novel one that, granted.
Probably wrong, but I figured it in my head as a hydraulics problem. i.e. small area vs big area, when the same pressure is applied to both, the valve/seat interface will experience a greater force than the rods. Therefore, I figured that the difference in forces between the two areas is probably more likely to see a valve and seat damaged than a rod (only applies to cylinder on compression stroke)
I expect thats wrong but I can't be bothered to give it more thought at the second, lol
James is correct its the rod or even the crank that will give way. In the case of my old 2ltr lump it was both that went. The rods twisted and the crank was forced out of alighnment!!!!!
The reason is the cylkinder is sealed and there is no way the water can be compressed.