I have a 98 civic with a D series I also had a set of 330 cc injectors will I have to change anything air fuel wise to install them? Also I hear people talking about swapping the head out a lot does this make a bug difference and what head can fit my car that'll give me the most gain?

Thanks for your help

 

seems like u have an ex
which means u already have a D16y8 with SOHC VTEC
so swapping heads will do nothing for you because u already have VTEC

 

okay so the only gain outta swapping heads in my car would be to get vtec... which i already have?

 

I posted in your other thread about the injector sizes.

If you do in fact have the D16y8, you already have Vtec. The only head that would really benefit you (although you really wouldn't notice it) would be the D16z6 head as it flows better. But like I said, you wouldn't notice the gains for the most part.