i recently bought a 2003 audi a4 18t petrol with snapped timming belt i took head off 13 valves were bent.I have replaced the valves put head back on set timming up and when i have fired up a valve hit number 2 piston i took it back off replaced that valve reassembled fired it up and a valve has hit number 3 piston could this be down to the timing it has got my hed battered can some one help me please

 

Apparently you did not install the belt properly. Do you have a service manual? It is good practice to turn engine by hand after installing a timing belt in order to prevent bending valves, and possibly breaking pistons.