{"product_id":"valve-guide-exh-nickel-bronze-004-size-74-shovel-66-77-pan-48-65-20-2034","title":"Valve Guide, Exh Nickel\/Bronze .004 Size, 74\" Shovel 66\/77 \u0026 Pan 48\/65, 20-2034","description":"Valve Guide, Exh Nickel\/Bronze .004 Size, 74\" Shovel 66\/77 \u0026amp; Pan 48\/65, 20-2034\u003cbr\u003e\u003ccenter\u003e\u003cb\u003eC630 Nickel\/Bronze\u003c\/b\u003e\u003c\/center\u003e\u003cbr\u003eC630 is a blend of copper, nickel, and aluminum. The high copper content gives excellent thermal qualities, the nickel makes the guides tough and wear resistant, and the aluminum brings work hardening characteristics. This bonze alloy allows for tighter clearances than other materials, creating better valve and seat sealing, as well as superior control. The expansion qualities of C630 bronze make it especially compatible with aluminum cylinder heads.\u003cbr\u003e\u003cbr\u003e\u003ccenter\u003e\u003cb\u003eCast Iron\u003c\/b\u003e\u003c\/center\u003e\u003cbr\u003eKPMI R\u0026amp;D has produced a proprietary cast iron blend that thrives in the tough operating conditions of today's engine. KPMI's certified cast iron provides excellent wear resistance and a superior guide bore finish that is easy on valve stems.\u003cbr\u003e\u003cbr\u003e\u003ccenter\u003e\u003cb\u003eManganese\u003c\/b\u003e\u003c\/center\u003e\u003cbr\u003eThese 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 the premium C360 Nickel Aluminum Bronze valve guides. The softer manganese guides are easily reamed and then can be delicately finished with our high quality ball tones. 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 C360 guides.\u003cbr\u003e\u003cbr\u003e\u003ccenter\u003e\u003cb\u003eSuperior Airflow\u003c\/b\u003e\u003c\/center\u003e\u003cbr\u003eGuide profiles are designed to have as little effect on the airstream as possible while maintaining critical cross sectional thickness in high temperature areas. Promoting both high performance and endurance.\u003cbr\u003e\u003cbr\u003e\u003ccenter\u003e\u003cb\u003eTight Tolerances\u003c\/b\u003e\u003c\/center\u003e\u003cbr\u003eHigh concentricity tolerances are held to insure 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.\u003cb\u003eKibblewhite\u003c\/b\u003e\u003cbr\u003eNickel\/Bronze exhaust valve guide\u003cbr\u003e.004 Size O.D.\u003cbr\u003eFits Big Twin 61 ci \u0026amp; 74 ci 1948\/1977 .5655 STD O.D.","brand":"Mid-USA","offers":[{"title":"Default Title","offer_id":32247561060431,"sku":"MID-61722","price":42.55,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0293\/7828\/1551\/products\/valve-guide-exh-nickelbronze-004-size-74-shovel-6677-pan-4865-20-2034-harley-mid-usa-897657.jpg?v=1596325753","url":"https:\/\/www.kandgcycles.com\/products\/valve-guide-exh-nickel-bronze-004-size-74-shovel-66-77-pan-48-65-20-2034","provider":"K and G Cycles","version":"1.0","type":"link"}