I am looking at buying a head for my 97 civic EX, the head has crower titanium valves and springs, and unorthodox adjustable gears. I would like to get it ported and bored but im not sure how much I should have it done, could you guys help me out. Also the guy was suggesting I have it polished, what exactly is polished and what does it do, also would I need to have my car taken to a dyno shop after these upgrades.

 

what kind of bottom end do you have is it stock? built? semi built?

 

http://www.sa-motorsports.com/diyport.aspx

when you add/remove more air into the cylinder head, you need more fuel to compensate, so yes, it should be tuned in the end to have any gains.

 

My bottom end is bone stock, what kind of power gains might i expect from a head job.

 

anywhere from 5hp-25hp depending on the supporting mods. that bottom end you will only be able to get so far