[Number 3]

A few people get this.

IF, big IF, GM wanted to do a little something, this is the easiest of all to do.

First, I was told years ago, the easiest swap is with the same engine block/family. With this there is very little packaging or changes to do.

Second, it's within an architecture so they will already know the body is essentially validated by judgment for the slight bump in HP.

This would be the easiest powertrain change GM could do and frankly it wouldn't surprise me at all.

Now some have said why not the LT5. Well that's a much bigger jump in HP and that would require some additional validation the Blackwing LT4 would not. Cooling for one, powertrain durability for another.

And with all that fanfare, if the additional 18 HP is even noticeable at that level, I'd be surprised. A numbers game mostly but GM does not hate the Camaro so showing a bit of low investment love might just happen.