This is true.
A helical gear is better design for the application, but once you triple the torque outsput of the engine, even aftermarket, high load bearing don't last as they should. If you made a set of cases to use a bigger bearing as some of have done, then you can go back to stock'ish gears (I say 'ish as the last big bearing engine I did required a different gear ratio on the primary, so I had to make a set of gears anyway. Of course, then I moved the location that I was taking the power off of the crankshaft entirely (center). :shoothead: :geek: )