!!Questions About Head Upgrade, KA-t builders help!!
 

A lot of the aftermarket cams need to have the head clearanced for the bigger cams. They remove metal somwhere for fitment. 5-angle valve grind with oversized valves would help breathing. Search KA valves on google and you'll find what I'm talking about. If you are the one port and polishing make sure to flow bench the head. If you don't know what you're doing you can remove to much and have ill-effects or have unequal flows between ports/cylinders.

I'm building my setup too but I'm going to leave the head stock. Many people have made over 400hp on stock heads, some even with stock cams. I say with you only wanting to make 320hp just leave it stock and spend the money on something else.

If you are trying to turbo the ka, ka-t.org is a good place for info. The whole forum is dedicated to it.

thanks for the info guys,..my buddy was telling me about letting it breath easier by porting it,..hes taking it to a machine shop to get it done, so yea i have know idea on doing that type of work...

If your goal is 240-320hp.
I would put that money towards the block instead of the head.

The piston rings are the main weak point in KA's when turboing.

That's it? You can do that easily with the stock head, s13 cams, and some fresh valve seals. Spend your money on the bottom end, fuel, and engine management. P n' P wouldn't hurt though.

^truth

Forged pistons, rods, ARP HS, new bearings, gaskets you should be good. Stock head would be fine for your goals, but I would get a 3 angle valve job, and make sure your valvetrain is still within tolerences.