ok! my friend was driving his car on the free way and his car turn off. so i go out there i pull the spark plugs and there clean, my first though was that he slack a valve but nothing so we get the car home , i pull off the valve cover and cams to check the valve train and its everything is ok. i check for head gasket being blow, drop valves and all spring seem to be ok. the motor idle fine and start up ok the only thing i can think is that it has rod knock i have never heard a rod knock so help me out!! oh yeah he was crusing on the free way


http://www.youtube.com/watch?v=N2a6ltotqF8

 

It's hard to tell because the noise is kinda muffled, but I would say it's a good chance that is what it is