Hello everyone, i have an 03 Honda Civic ex. I really am not to familiar with what engine you can swap into this vehicle. I have been doing research but haven’t been lucky enough to find anything. The reason why I want to swap my engine is because my coolant and oil are mixing(bad head gasket). It’s been doing it for a while but now it’s getting to the point to where I’m putting coolant everyday because I’m running out. I would like to put an engine that has a bit more power then the stock one. Thanks in advance to everyone and anyone that can help.