is it a good engine? i want to turbo charge, and everything possible to it. if its not the best, what is the best that will fit into the HONDA CIVIC SI thats dohc and v-tech that i can add preformance parts to make it have the most acceleration and torque.


A K20 is a pertty fast engine. yes it will fit however you will need to do accouple of modifications. I would perfer the K20 over the B16A anyday.
husla_69 what the heck are you thinking, in what world do you live?
How can you say that the k20Z1 is a lesser engine when is more powerful than a B16 by a huge marging on his stock form (52hp/30tq)?
Back to the main question…
Since you already have a B16A2 it will be more cost effective to just find a B20 block and use it with your B16 head. With the right parts you can end up with a engine build that produces similar numbers than a K20. These kind of combinations can get you easily to the 12’s naturally aspirated more than enough to kick some @$$ around town.
Believe me use a B20 you won’t regret it and you will save a lot of time and trouble.
it’s vtec and you are better off keeping the b16a2 in there. intake/exhaust/headers on your b16 and you will go much further.
k20z1 is a lesser motor…not worth the swap