Re: Motorcycle main jet sizes

[Bryan Savage <b.a.savage@earthlink.net>]

I don't know if Holley still does it, but they used to flow test their 
performance
jets and THEN mark them. The hydrodynamic propitious of the entrance, exit,
surface finish, diameter and length of the orifice are all have an 
effect on the flow.
 I can make a # 70 Holly jet flow like a # 75 and a drill can't detect 
it because I
won't change the diameter of the hole,

Bryan