Now I know that most of us here run SOHC myself included. I love my engine. BUT I am no fool to assume that four valves are no more superior than two. The following article is a very good write up of WHY four valves are superior to two valves. It even touches on five valve heads a little bit. It is very long so if you are not truely interested or dont really care to learn the truth then dont even bother.
http://www.billzilla.org/2v4v.htm#friction
http://www.billzilla.org/2v4v.htm#friction
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