ENGINE SECTION RED PART NUMBERS INDICATE NEW PARTS 6-34 1 2 3 4 5 6 7 8 9 10 11 CONTENTS REFERENCE GENERAL EXHAUST FUEL DRIVE TRAIN ENGINE WHEEL CONTROL FRONT END FRAME ELECTRICAL Valve Guides VALVE GUIDES FOR ALL MODELS C630 Nickel/Bronze We choose to use the copper based C63000 nickel-aluminum bronze as a material to make our bronze valve guides, because of its ideal characteristics for the application. The 5% nickel content provides superior resistance to wear, and the approximately 80% copper content delivers outstanding heat conductivity. KPMI® guide profiles are designed to have minimal effect on the airstream, while maintaining critical cross sectional thickness in high temperature areas, which promotes high performance and endurance. Cast Iron After chemically separating several samples of cast iron material, and analyzing and evaluating the test data, we decided to have our own specification of cast iron made exclusively for us. We specify elements such as carbon, silicon, manganese, nickel, chromium, copper and sulfer to produce a highly pearlitic structure with dense fine grains, and excellent wear resistance. Manganese These Engine Builder valve guides have been designed with the price conscious builder in mind. Expect the same exacting KPMI® tolerances, but with a reduced toughness/wear-ability when compared to premium ‘C630’ nickel-aluminum bronze valve guides. The softer Manganese guides are easily reamed, and then can be delicately finished with our high quality ball hones. Now, with any battery operated or electric drill, you can ream and hone manganese valve guides in less time, and in the absence of expensive honing equipment required to properly size “tough” Nickel Bronze guides. Superior Airflow Guide profiles are designed to have as little effect on the airstream as possible, while maintaining critical cross sectional thickness in high temperature areas, p romoting both high performance and endurance. Tight Tolerances High concentricity tolerances are held to insure that the best possible geometry between the seat and guide is maintained when the guides are replaced. This means minimal material removal from the seat, time savings, and consistent chamber volumes, when valve jobs are performed. Knucklehead 1936/1947 Std –– –– 61630 61630 –– –– .002 –– –– 61631 61631 –– –– .004 –– –– 61632 61632 –– –– .006 –– –– 61633 61633 –– –– .008 –– –– 61634 61634 –– –– Big Twin 61ci & 74ci 1948/1977 Std 61710 61718 61531 61539 –– –– .5655” STD O.D. .001 61711 61719 61532 61540 –– –– .002 61712 61720 61533 61541 –– –– .003 61713 61721 61534 61542 –– –– .004 61714 61722 61535 61543 61661 –– .006 61715 61723 61536 61544 –– –– .008 61716 61724 61537 61545 –– –– .010 61717 61637 61538 61546 –– –– Shovelhead 80ci 1978/1983 Std 61700 61635 61513 61522 –– –– .6245” STD O.D. .001 61701 61706 61514 61523 –– –– .002 61702 61707 61515 61524 –– –– .003 –– –– 61516 61525 –– –– .004 61703 61636 61517 61526 –– –– .005 –– –– 61518 61527 –– –– .006 61659 61638 61519 61528 –– –– .008 –– –– 61520 61529 –– –– .010 –– –– 61521 61530 –– –– Big Twin Evolution 1984/1999 Std 61648 61648 61501 61507 –– –– .562” STD O.D. with .001 61649 61649 61502 61508 –– –– .420” O.D. valve seal area. .002 61650 61650 61503 61509 –– –– Twin Cam 1999/2004 .003 61651 61651 61504 61510 –– –– Sportster Evolution 1986/2003. .004 61652 61652 61505 61511 –– –– .010 61653 61653 61506 61512 –– –– C630 Nickel/ Bronze Cast Iron Manganese Continued On Next Page Size C630 Nickel/Bronze Cast Iron Manganese Model & Year O.D. Intake Exhaust Intake Exhaust Intake Exhaust
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