No Compression Hyundai Matrix Compression

Hello greetings to all my problem is that I have a Hyundai Matrix 2005 that the belly of time is revant ... We lower the cylinder head and there were 2 crooked valves we replace them we clean etc but now that we mounted the butt there is no compression in the engine we try outside the jiro of the camshafts and there are valves that remain open but when I remove the trees of
cams Canoso to think thanks ...

Is it an engine with hydraulic taes? If it is, they must be installed downloaded from its internal pressure.