With the new S&S Cycle CNC porting service for 2004-’14 Harley-Davidson Sportster models you can send in your heads and S&S Cycle will give them the CNC treatment for less than you’d pay for a comparable set of new performance heads. You get your same heads back with new premium valves, bronze guides, and high-lift valve springs. You also have the option of buying a set of CNC ported 1200cc heads outright.
The program for Sportster models is slightly different from the big twins because the heads for 883cc engines and 1200cc engines are not the same.
See S&S Cycle Inc. in the Buyers Guide