Topic: Not SOHC, but it is a Honda and definitely HiPo! Enjoy.

[NickO]

And how about a bore that is more than 2x the stroke (97mm x 40.5mm)!

http://www.racecar-engineering.com/articles/f1/hondas-f1-engine-revealed/?utm_medium=email&utm_source=The+Chelsea+Magazine+Company+Ltd&utm_campaign=3403258_RCE+December+Editorial+2013&dm_i=6NM,20XYY,5BEY7E,7ALCU,1

[turboguzzi]

gotta love those paper thin hollow cams!
it's interesting that it's Shuhei Nakamoto telling about the F1 engine dev. as he currently heads HRC. not hard to imagine that many of these solutions are employed in the current RCV series

[MRieck]

Not much porting necessary on those ports.

[Old Scrambler]

The valve weights and sizes sure changed during development