Oh, OH cams are "overly complex", huh? I guess that's why about 99%
of vehicle engines use them. LOL
What a load of crap. Engines are most efficient at their torque
The RPM's the motor is spinning is not that significant, and (duh),
the smaller motor is simply geared-down more to compensate for it's
preference for higher RPM's.
Then, there's the increased weight of the larger, less-efficient push
rod engine. What's that do for milage?
Pull your head out and look around you. OH cams are better in most
situations. That's why they are made. Duh.
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