Oversize Exhaust Valve Guide. Fits Sportster 1957-Early 1983. +.001in. Outside Diameter.

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* 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 = .5655in. Std size

* ID = .339in.

* Replaces OEM # 18172-57B