A&Q about 350Z
Q:
Does anyone know what i can do to my cylinder head to improve the performance?
A:
How about a little more description... make, model, year, which engine?
A:
sorry, its a renault laguna 2.0 8v 1997 (f3r type)
A:
Have a machine shop deck and mill it for ya.
Porting heads is the way to go for increasing air flow. On my engine at least, (3.4 L) an aggressive porting can increase airflow by around 20%.