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Heads - the heads have been reworked for the R to provide better flow
Oil Pan - Canton Oil Products racing oil pan (9 quarts!)
Pistons - forged pistons (much stronger for racing)
Rods - titanium (again much stronger)
Crank - billet steel (again, you guessed it.. stronger)
Stroke - longer stroke than the normal Navigator motor to provide more "uumph" (that's a technical term)
Intake - a special "R only" intake plenum - this one SVT will NOT sell you if you are not an R owner - so you'll have to resort to something else in the aftermarket.
Headers - short tube headers for increased flow of spent gasses
Cast iron block
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'00R heads are completely different castings than any of the other modular 4v heads to date--save the '05 GT which uses a slightly modified version of the '00R heads. '00R heads use a +2mm exhaust valve sizing (32mm vs. 30mm) and even have a specific vavletrain (featuring a Dodge Neon adjuster) not shared with any other head. '00R heads flow more stock than a stage II (80-85%) set of ported Navis.
The rods are billet steel, not Ti.
Crank is a regular forged ( 8 bolt) Navi unit.
The '00R engine has stock dimensions (no extra stroke) those being 3.55"x4.165"