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Not so. In the RB Racing article, read the paragraph immediately following the one I quoted, and look at the illustration further down the page.
Harley's have their valves in a Hemi layout.
None of their heads look anything like this, the illustration is a bad joke, there is no engine that looks anything like that when cut in half. The layout shown in the picture has quench covering half the piston, which make it very bad.
From the RB Racing page: It's a simple fact: The closer the flat of the piston to the flat of the combustion chamber, the more power you will make.
That might be true if you were to ignore pumping losses, but it's like raising the compression, were there are diminishing returns due to pumping losses.
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