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Originally Posted by PorscheDoc
Can you provide the source of this information?
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Nope. I do remember it from my youth when looking at swapping out engines because of emissions equipment. That was one of the great things about owning an older muscle car - you could always get a better engine. But, you couldn't go backwards.
I suppose it's possible that they are more relaxed on that issue or have exceptions - but I doubt it. It would be too hard to regulate. Think about it, they're not going to allow you to put a '65 engine into a 2006 vehicle.
If I had the time I'd look into the regs...