Valve Guide - Intake - 0.3957" OD - Yamaha
- Softer Manganese guides are easily reamed, and then can be delicately finished with Kibblewhite high quality ball hones
- With any battery operated or electric drill you can ream and hone manganese valve guides in less time
- Expect the same exacting KPMI® tolerances, but with a reduced toughness / wear-ability when compared to premium C630 Nickel Aluminum Bronze valve guides
- Made in the USA
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