I would like to know the bore and stroke of the various new engines out there. I think the ford 5.4L has a bore of 3.5" and a stroke of 4.16", but what about the 4.6L? Also, I know nothing about the new Chevy 4.2L 6cyl, and the 4.8L, 5.3L, and 6.0L V8's. I couldn't find it on the chevy site. My dad's Silverado (yeah I know...) with the 4.8L does seem to like to rev up, and I'm trying to find out why.

Mainly, I'm interested to see if they're all making the bore smaller than the stroke, and for what reason? Is it emissions, mileage, what? And, who does this give the advantage to?