You guys reaaaaally need to go pick up the latest issue of MMFF and read about. Or at least stop by Books a Million and read the article. There is a lot of misinformation floating around in here.
Like it has been said, the V10 is basically a 4.6 block lengthened by two cylinders. They say that they literally took 2 4.6 molds and cut them in two, then stuck the two halves together. They did the same with the molds for the Cobra R intake and heads. I believe it also uses lengthened N/A Cobra or Mach 1 cams and 03 Cobra Rods. Compression is only around 10:1.
They say the engine is actually an excellent fit for the engine bay because it is built off the 4.6 block. The overall length is only 4 inches greater than the regular 4.6. Supposedly the engine is actually a lot cheaper to build than the 03 Cobra engine.
Also, its not 425 HP. It was over 400rwhp/tq with 4-6 cats, 4 mufflers, and crappy headers to keep it whisper quiet.
Blah blah blah... I WANT ONE!