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Re: Modular vs. Pushrod engines
They don't have only 2 or 4 valves... total. It is 2 or 4 valves per cylinder, and now even three.
They "work" by actuating the valves from one or two overhead cams per head. 2&3 valve/cyl engines use a single cam per head, while the 4V/cyl engines use two cams per head. The valves are actuated by roller followers that rest on the valve stem on one end, and a "lash adjuster" (spring loaded lifter) on the other end as a pivit point. The cam is basically centered over the middle of the follower where the roller is.
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