repeat to get back on topic please gentlemen

So lets go back to my penultimate post (excluding this one ). Are the statements that I have made correct? (best to make sure it is going in PMSL)

Second, are there any negative effects of the increased port size. For the purpose of this article, lets use Karl Norris' range of heads (becuase IIRC he has std, stage 1, stage 2 and 3 (?).

So given that this is for scientific interest. Lets say I simply bolt a stage 3 head onto my car with the std cams and the same turbo (ie keeping with all other things remaining equal (which is what ceteris paribus means for those that didnt know ))

Now clearly the stage 3 is designed for folk looking to do other mods also, but lets use the example for the purpose of the discussion. We know that the engine will flow more air, and as such the map will need to be modified to reflect the increase requirement for fuel.

But what else is going on?

JJ