Intake & Exhaust Valve Guide. Fits Big Twin 1948-1979. Standard Outside Diameter.

* Designed for Harley-Davidson heads

* Same Guide fits Inlet & Exhaust

* Use with OEM style valve seals

* Manganese-Bronze

* High temp viton o-ring seal

* Smooth lead-in

* CNC machined

* Guide ID unfinished

* OD = .566" Std size

* ID = .375"

* AV-VGRC-3782 Reamer recomended for AV&V guides & valves

* Replaces OEM # 18138-79