connecting rod problem

#1
Installed the arc billet rod with bearing....cl1 cam 18lb springs

So at first i cant even pull start the engine so i loosen the rod up

Now i can start it.....runs good then bam1

Rod bolts.come.loose an.knocks againt my block


But i cant tighten it up or i cant even pull start it

Any ideas whats going on?
 
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