Ben,
     If this is the same knock that is more prevolent on startup, relax.
This is a known issue with 3.L nissan engines  and it has no effect
on the long term of the engine.  TSB's have been out on this for years.

                                                           ERic

Benny boy wrote:

>If you can "Cooked" a trany with a Boxer 2.1L, i can imagine what a 190HP
>could do to this one!!!!!
>
>Anyway, am working on a Nissan 1992 300ZX engine those days....they sucks, i
>cannot find the head "knocking" problem(S), injection remove and replace,
>Hydro lifters replaces, cam check and replace.....grrrrrrrrrr, i still have
>that noise and a low performance from the heads side????
>
>I hate this car, 3 engines in 4 years.
>
>Ben
>
>
>
>