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Kibblewhite Precision 20-21020 Manganese Bronze Intake Valve Guide - Standard chemical-engine-oil-0w10 2019-2021 Ski-Doo Summit X E-TECOutside Dia.: (G)0. 4750in. Std. A: 0. 480in. B: 0. 545in. C: 0. 540in. D: 1. 110in. E: 0. 600in. F: 0. 2347in.. Precision machined guides. Manganese bronze guide material is softer than nickel aluminum bronze valve guides. Excellent heat conductivity which promotes long valve life. Material hardness helps support valve guide longevity. Guides can be easily reamed with a battery operated or electric drill and finished with a high quality ball hone.