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Originally Posted by r3dn3ck
I think the single biggest issue with the 5.4 is the cams. They just plain lack duration sufficient to fill those loooooong chambers well. Add duration and things get right interesting on the quick.
The 6.8L V10 is a 5.4L with 2 extra holes. It uses the same pistons and rods as the 5.4, but only the pistons are the same as the 4.6.
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1. GOOD POINT!! The same long duration cams in a 4.6 will not be as lumpy or high revving in a 5.4L.
2. Yet another point brought to light, perhaps my reading was of the 5.4 to the 6.8 motors when the 6.8 was due to come out. I still thought 5.0's ruled the world back then.