This is quite normal with some ABC engines. As others have said, the liner has a taper when cold and gives an interference fit to the piston when it's very close to top dead centre. Turn the engine over slowly and the piston sticks in the liner. This puts quite a bit of load on the conrod and crankshaft so when you turn the crankshaft that little bit extra all the loads suddenly release and you hear that clicking noise. Most of that click comes from when the rod clearances suddenly move to a different part of the rod, mainly at the wristpin in the piston. It's a very bad idea to turn over a brand new ABC engine slowly before it's had some fuel with proper oil through it. In fact it's best to never do this even after it's run in just to be on the safe side.