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
