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They are correct, but in both cases they are talking about Harley's which have Hemi heads.
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. The other article on motorcycle.com does use a Hemi in the illustration, but does not ever mention that the advice applies only to Hemis, and the site is not Harley specific.
What clearance did he recommend?
Whatever I think is the minimum safe clearance for any specific engine.
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