KIBBLEWHITE Manganese Valve Guide — Oversize (+0.025"), 0.3760" ID, 0.5900" OD – 48-72, 78 Big Twin
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Precision-machined manganese bronze valve guides; easy to ream and finish with common drills and a ball hone. Accepts OEM and aftermarket seals. Made in the USA. Requires Viton or teflon valve seals.