There are some interesting tweaks on this engine:  Dual stage intake and
exhaust!

As far as an all gear cam driving system goes it would be more
expensive, complicated to make, and heavier on an opposed four with four
cams than an in-line engine. LOTS of gears would be needed, all fitting
together to close tolerances.

More info from the Subaru Web site (how many years before Kennedy makes
a kit?!!  This mod would be worth the trouble.)

All-New High-Ouput Engine
 The horizontally opposed layout gives the Subaru H6-3.0
 powerplant inherent smoothness without the need for
 power-robbing balance shafts used in some V-6 engines.
 Liquid-filled engine mounts contribute to the smooth, quiet
 ride. The horizontally opposed design also provides a
 lower center of gravity which enhances handling and
 performance.

 The new Subaru high-output H6-3.0 features an
 aluminum crankcase, double-overhead camshafts and
 four valves per cylinder. A direct ignition system uses an
 individual ignition coil for each cylinder, eliminating the
 need for a distributor and sparkplug wires. The engine
 displaces 2,999 cubic centimeters (183 cubic inches) and
 produces 212 horsepower at 6,000 rpm and 210 lb.-ft. of
 peak torque at 4,400 rpm. By 2,200 rpm, the Subaru
 H6-3.0 engine is already producing a substantial 174 lb.-ft.
 of torque, providing quick response at lower speeds.

 The H6-3.0 produces nearly 30 percent more horsepower
 and torque than the 165-horsepower 2.5-liter H-4 in the
 Outback Limited model, yet is only 20 millimeters
 (0.8-inch) longer than that four-cylinder engine. Like all
 Subaru models the new Outback H6-3.0 models run on
 regular fuel, but 91 octane is recommended for maximum
 performance.

 Dual-Stage Intake And Exhaust
 The new Subaru H6-3.0 uses a variable intake manifold
 and a dual-stage muffler to optimize power delivery
 throughout the engine speed range. Low-speed and
 mid-range power have not been compromised for
 high-rpm power, and vice versa. The variable intake
 manifold features an induction control valve that provides
 two intake characteristics. Below 3,700 rpm the valve
 remains closed to create a long intake runner length,
 helping to boost low-end and mid-range power. When the
 valve opens above 3,700 rpm, the manifold creates a
 "scavenging" or light supercharging effect, allowing each
 cylinder to catch high-pressure waves of intake air
 bouncing off the opposite side of the manifold.

 A mechanical valve in the rear muffler varies muffler
 volume to help enhance engine power in different speed
 ranges. At lower engine speeds (around-town driving, for
 example), the valve remains closed to provide a
 smaller-volume muffler chamber. The resulting level of
 exhaust back-pressure enhances power at these speeds.
 When exhaust pressure reaches about 22 psi -- which
 occurs at about 2,400 rpm -- the valve opens to allow
 exhaust gas through an additional chamber. The resulting
 increased muffler volume reduces exhaust
 back-pressure, enhancing power at higher speeds.
 Muffler valve operation does not affect the noise level.

--
Stuart MacMillan
Manager, Case Program
800-909-8244 ext. 8208
Fax: 206-269-6360

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