I'd love some example as to w/ a d16 is close to a b16? Please, if I am soooooo wrong find some evidence, prove me wrong...maybe you can't read that well...my main point is that a sohc built to the max and a dohc built, the single WILL NEVER MATCH THE POWER OUTPUT OF A DUAL due to MANY FACTORS that I'd rather not go into detail over due to it's over most peoples heads. Otherwise every racer would use singles and not duals, more power potential w/ a dual.
The only thing you quote is my inability to see a 4 hp increase over switching from 10/30 to 5/30 when they are VERY close in viscosity...please.