There is no direct proper answer to that question because the drilling for any ball depends on the ball, and the oil pattern and lane surface on which you intend to use it and how you want it to react. The other factors, like your release and PAP, are also pertinent but will remain a constant for most balls.
In the vaguest general terms, slower speeds like yours will usually benefit from a higher pin position, but that should never be interpeted as "you must always do that." For example, oilers to used used on heavy oil patterns should almost never have the pin above the fingers.
Pins placed higher will go longer than pins placed lower, BUT only relative to the same ball with the same surface condition.
Edited on 3/2/2005 7:43 AM
