Originally Posted by
juffer
IMO if you port the exhaust ports you will get better gas flow which will then make a better spool up on the inlet side. But the problem is i think that you are then restricted as the inlet is now trying to pass more air but still restrictive. IMO i would port both but i think the exhaust port would be the main advantage because if you ported the inlet you are still not getting the gasses out any quicker
The gasses will be exiting at the same rate what ever you do the the exhaust side mate, the piston makes sure of that.
Had a chat with a mate today who is pretty knowledgeable with heads etc, admittedly more so on the A series. He agrees that porting the exhuast will have little effect on lag for the above reasons, however he did point out that if you only sorted the exhaust port (and if it was restrictive) the car would naturally be making more power/torque off boost due to a slightly larger VE the car could come on boost faster if this were the case.
Rob,