Originally Posted by bob

Probably a longevity issue using the 4.6 deck height, anytime you add stroke and limit the R/S ratio, side loading on the piston goes up which effects longevity and mechanical effciency due to increased friction. Its not really an issue in the aftermarket but for an OE trying to keep the EPA off its back (more emissions than mileage), you've got to take every advanate you can get.

My question has always been; Why didn't Ford do an aluminum 3v 5.4 with an M6/A6 trans from the get-go?

That would have been 350hp/375tq if trimmed out like the 05-09 4.6 3v GT motor and about 370hp/380tq in 2010 trim, plus Ford could have had an all aluminum 5.4 4v in 2007 with the GT500.