Treaded valve ????

I have a astra g 1.6 16v 1999, I broke the water pump with only 30,000 km, jump distribution belt, when riding new pump and distribution, the engine does not endure the release goes like three cylinders, I would like to know if this is due to a footprint and how to know it safely, or on the contrary it can be something else.

hello..Pone the piston q failure in compression position (closed valves piston above) must be exact the point, puts air through the hole of the candle and should not come out air through the mufla or escape or by the admission a father our father and ready

I am comprehensive, salts of doubt immediately, if there are valves footwear it will be a brand of 0 or very little precion, it passes a lot with today's vehicles jump teeth and bend valves.