Intake Valve Seat Insert, +.005  (OEM/NOS #18058-66)

We're not finding this part number is our Factory references.  The nearest number we found was 18057-66 for FL Shovelheads 1966-79, so we presume it's for Big Twin applications, but more research may be required.

• Condition:  New:  (OEM/NOS)
  
• Models:  Shovelhead
  
• Vintage:  1966-79