[akshay1234]

Originally Posted by swathyd

Is there so much work to be done. What do they do by porting , any serious work like re routing etc or simply doing something for money.

2. Head Porting & polishing:

• Cylinder head porting and polishing refers to enlarging and smoothening of the ports on the intake and exhaust. This results in better quality and quantity of gas flow-rates. Power gains are very noticeable from a high-quality porting and polishing job. Remember that the intake ports need to be finished rough while the exhaust ports should have a mirror finish. Approximate cost = Rs.9,000 – 15,000.

from GTOs thread.