Oddly enough, no. But I'm much more worried about the cracks, and their origin.
For me (cobra daydreamer) I would prefer the Ford motor over the chevy 350. But that being said, I would much prefer the LS7 motor over the ford. Why? Weight, power, $$$. (although a crate LS7 is gonna set you back about 20k by the time you get it running)
As a previous poster pointed out, I think it's something about the magic number... 427. But also the other magic number. (505hp) In stock configuration my 08 Z06 will lay down somewhere between 460 and 485 at the back wheels. I say somewhere between, because I've not had mine on the dyno, but attended a dyno day at Corvettes of Dallas where 13 cars did exactly that during the day. (in stock configuration) At the same time, my car does register consistant mid-high 20's in the mpg category, when I can keep my foot out of it. And that car is roughly a thousand pounds heavier than the cobra.
All that being said... no way in hell would I put a Chevy motor in my F350.
