Im looking into putting in either a b16 or an h22 into my 96 civic. Later on down the road i plan on doing this stuff anyways, but as far as getting it in and out of the garage and onto the street ASAP, would i have to replace the radiator and fan with the motor? Right now the engine is the d16y7.

 

h22-dual core radiator and a slim fan
b16-you can use your factory

 

It's really up to you. Replacing the radiator is not absolutely necessary to have your car running. I know a lot of hybrids(b16,gsr,itr,h22) running stock CX & DX radiators with no overheating or leaking problems. On the other hand, my radiator only lasted 3 months after the b18c1 was dropped in. Eventually, it would be a wise idea to replace the radiator but it's not a necessity on a swap like let's say the ecu or axles.