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Just taking stabs here.... Simplicity? It would mean you don't have to set the timing for both cam gears when you change the cam belt, just have to set it for one?
What about the valve setup? To use 4 valves (rather than 3 or 5 and offsetting the cam lobes)? That said, are there any engines that use SOHC with 4 valves (I asssume so). Would it not be harder to have a single camshaft moving all 4 vavles and still have the correct (different) duration/lift for both the intake and exhaust valves, even when using rockers?
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