Originally Posted by JAMMINKRAZY

That crank in your pics is an OS Speed crankshaft. It is drilled and THEN filled as 22racer said. The drilling is what does the real magic in that it lightens the crankshaft making throttle response more crisp. The epoxy just fills the empty void created by drilling, and brings crankcase volume back to what it was before the drilling. Simply adding epoxy to the crank ramp will not do anything other than further decrease case volume and slightly obstruct the flow of fuel/air mixture if you go too far with it.