Originally Posted by jWESTFOO
BTW, I've been reading up on some other threads and people have been talking about just buying a new Vtec head. Maybe I still dont understand enough about it, but that leads me to beleive that I could do the same with a Si Vtec.
The only engine you can swap into your car is the K20a/z_
Unfortunately even then it is not worth it becasue you cant build the suspension the same way as with older civics to handle the power properly. The entire 2001-2005 Generation of civic is the red headed step-child of the bunch, you are better off just driving the thing for what it is, a commuter car.
You cannot bolt up any other head to the D17a2 block other than the D17a2 head, only a D17a1 head can bolt up which would be a downgrade.
The 2002-2005 Si uses a K-series DOHC motor, a DOHC head will not bolt to a SOHC block, I've never seen it done on a Honda anyway. Turbocharging the motor is a waste of money as well.
04 Mazdaspeed Miata #2373/4000: IHI, BBS, Harddog, Flyin'Miata.