Originally Posted by RyanRaduechel
And a motor swap in CA can only be from the same make and model car, just different years.
No, you can do other swaps, there are just some rules you have to follow.
For starters, the donor engine must be of the same or newer model year than the chassis which it is going into.
Also, you must retain all
of the emissions-control hardware applicable to the car in which the donor engine was installed.
All of it.
It's not impossible, but it's a hell of a lot of wiring and sensors. There's a reason that the kit-car guys prefer working with pre-1967 engines.
Let's say that you want to install the engine from a 2003 Corvette into your Miata. For starters, the Miata itself has to be 2003 or older. This would be an illegal swap in an '04 or later car. And of course, you need to carry over every single piece of emissions hardware with it, which, from a technical perspective, includes the whole exhaust from headers to cats, all the canisters and vapor-recovery ****, etc.
The referees are permitted some leeway in this. They can, for instance allow you to make a modification to the midpipe in order for it to fit into the car, so long as the overall dimensions windup being the same. They are not likely, however, to pass you with a set of custom-fabricated headers unless they have a CARB-EO on them.