240sx won't start

[nisjay]

I put a cometic head gasket on the other day, put everything back together and now it won't start. It seems like its trying to crank but then just clicks after 5 seconds, The battery,starter, and fuel pump are good. I redid the timing chain and cams yesterday but still the same problem.

BTW - What does the number on the cam mean? I had 4 cams from 2 engines that had different numbers. one has 4, another has 3, and another has 2. and the other cam I threw away because it broke so I don't know its number. Cam 2 and 4 are the same and 3 is different.