RB26DETT Rebuilt engine nasty valve train noise on start up

[Street GT-R]

RB26DETT Rebuilt engine nasty valve train noise on start up

I just replaced the head gasket on this engine. I accidentally started the engine without priming it. After the start up, it immediately developed this nasty valve train noise. Does anyone know where is the noise originated from and how to fix it. 

Here is the you tube video: https://www.youtube.com/watch?v=51lzWDkK2nw

 

[n1tro5]

Find the problem? Sounds like wayyy to much gap between the cam and buckets.

[r32-25t]

Make sure there is oil getting to the head