I'm getting a GSR motor put in my car. I'm wondering if the stock radiator in my stock Civic DX would be sufficient enough for the motor.

 

If you plan to drive it hard (as most swappers do) a del slo vtec dual-core radiator slips right in, no modification necessary. A teg radiator will also fit with some modification (pretty easy stuff). I always tell people to go with the del slo rad since its a little lighter. I'd upgrade it, but you can wait till you've got the dough... nothing urgent.