[Christ]

roflwaffle -

According to EPA's guide on engine switching, that is incorrect. The chassis/engine must be from the same manufacturer, and the end result must mirror exactly an EPA/CARB certified configuration.

That means no 6.5 diesel in your Civic, friend.

It goes so far as this: The L-series GM engine in the Saturn Vue from certain years was actually a Honda engine. The exact same engine from any Honda car is not legal to install in the event of engine failure, because even though it's the same engine, it's not from the same manufacturer. If anyone had done any checking, and properly re-registered the vehicle after the switch, it would be tagged and no longer legal for road use.

This isn't just Cali, either. It's the EPA in general. It's illegal anywhere in the US to do these things.