- Designed for Harley-Davidson heads
* Use with OEM style valve seals
* Cast Iron
* High temp viton o-ring seal
* Smooth lead-in
* CNC machined
* Guide ID unfinished – Requires honing
* OD = .5645in. Std size
* ID = .339in.
* Replaces OEM # 18170-57B
* Use with OEM style valve seals
* Cast Iron
* High temp viton o-ring seal
* Smooth lead-in
* CNC machined
* Guide ID unfinished – Requires honing
* OD = .5645in. Std size
* ID = .339in.
* Replaces OEM # 18170-57B