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Yeah, and several comparisons have been done to indicate that other than the lack of pushrods, there really isn't any advantage to OHC engines other than the DOHC so you can time each of the cams individually. That, and it makes the blocks taller in most cases, given the extra height of the cam in the head vice just above the crankshaft. There was a Hotrod magazine article (I believe), where a guy went to the trouble of building a set of pedistals for a SBC and installed two stock cams (for honest comparison), and you could literally take the two dyno runs and lay them on top of one another, they were so equal.

Still, it would be cool to see the technology involved in doing this so many years ago.
 
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