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While the long stroke, small bore configuration limits breathing above the 5200 redline, the design is fine for intended purpose. Think of it in terms as a sophisticated lawn mower engine. It does what is intended over a broad range of finished operating weights.
In the application I use, 2 valve in e450 performance is good. Even with trailer attached, acceleration is solid when merging or leaving at stop. MPG is acceptable at 9 to 11. Empty it may do better with a 4.30 or 4.11 gear in place of 4.56 but then performance may suffer with trailer. Overall I do not see any point trying to redesign effective architecture. The new v-8 looks good along with 10 speed trans but it would need to have a drastic improvement to pay for replacement of existing engine in my application. Just as with a diesel, trading up just is not justified on a ROI basis for me.
In the final analysis is it really worth concern when there are many miles left in our unit?
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