![]() ![]() The stupid curves in the cylinder head to accommodate close to SOHC carb centers are worth close to 25 hp., when the engine is tapped all the way out. You also have no idea how we dog the DOHC for unfulfilled dreams that Honda could have made simple easy cheap changes to make them MUCH more powerful. Magazine times are often unobtanium, they are not real. Later header and carb work and sprocket hit 12.50 on the 750F. I had fits getting to 12.80s-12.70s on mine at 170 lbs. Look at average CB750F times, almost impossible to get below 12.50 real world. Most faster DOHC times were set by him like many other fast bike times of that era. AS well, by the time the DOHC rolled around most of the bike magazines used Peewee Gleason to do 1/4 mile testing as he weighed 120 lbs. Top speed is a waste of time, change the final drive and both will run 130 mph, you picked theoretical top speeds assuming the DOHC will hit 9500 rpm, they often won't since the CV carbs limit full open. I put the real world difference at no more than about a half second or so. You're picking extremes, there are DOHC that won't break 13.0s just like that and the early SOHCs could hit high 12's when tuned correctly. ![]()
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