I had my 2 heads replaced by a mechanics (350z 2005). Right after I see low idle RPM with extremely low oil pressure (close to 0 at idle).
A week after my catalytic converter on the driver side melted. Now I hear a knocking noise when accelerating. I don t know what to do as I believe that my mechanic probably did not re-wire everything properly when installing the new heads. Any ideas?

 

You might start by taking it back to your "mechanic". No one is going to be able to diagnose this remotely.

 

Sounds like your mechanic owes you an engine

 

Does anyone know a serious mechanic in Smyrna or Marietta Ga?
A guy who is not a crook and who knows 350z.

 

http://lmgtfy.com/?q=reputable+mechanic+in+smyrna+ga

 

http://lmgtfy.com/?q=nissan+dealership+marietta+ga

 

Call Z1 in Carrolton, GA. I trust them w my zr.
770.838.7777.

 

Forged close to you?

 

Good call Chad!

 

Op, that's Forged Performance in Marietta

 

Looks like one or more of my rods might be dead....any idea how much it should be to replace those?

 

Nope, call Forged or Nissan to get a quote.