{"product_id":"kpmi-intake-exhaust-valve-guide-bronze-mpn-91-91220","title":"KPMI Intake\/Exhaust Valve Guide Bronze [MPN: 91-91220]","description":"\u003cdiv class=\"wrap-collapsibleMM\"\u003e\n\u003cinput id=\"collapsibleDescriptionMMe0976870\" class=\"collapsibleDescriptionMM toggleMM\" type=\"checkbox\"\u003e\u003clabel for=\"collapsibleDescriptionMMe0976870\" class=\"lbl-toggleMM\"\u003eProduct Description\u003c\/label\u003e\u003cdiv class=\"collapsible-contentMM\"\u003e\u003cdiv class=\"content-innerMM\"\u003e\n\u003cp\u003eWe choose to use C630 nickel bronze as a material to make valve guides because of its ideal characteristics for the application. The 5 percent nickel content provides superior resistance to wear, and the 80 percent copper content delivers outstanding heat conductivity. Guide profiles are designed to have minimal effect on the airstream while maintaining critical cross sectional thickness in high temperature areas, promoting high performance and endurance.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGuide profiles are designed to be as clean and unobstructive to the airstream as possible, while maintaining critical cross-sectional thickness in high-temperature areas, promoting both high performance and endurance\u003c\/li\u003e\n\u003cli\u003eIn many instances because of the nose shape, just the installation of the guides with no other modifications will enhance airflow\u003c\/li\u003e\n\u003cli\u003eWhere the factory base washer allows for it, guides have a flange that sets the protrusion at a height that allows for correct seal-to-retainer clearance for the most aggressive cam available at the time the guides are designed\u003c\/li\u003e\n\u003cli\u003eOnce the flange touches the head, you're home\u003c\/li\u003e\n\u003cli\u003eNo time lost stopping to measure guide protrusion several times during installation\u003c\/li\u003e\n\u003cli\u003eIn cases where a flange would interfere with the factory base washer fitment, a small decrease in diameter above the purchase area marks the correct guide protrusion\u003c\/li\u003e\n\u003cli\u003eVery tight concentricity tolerances are held to ensure that the best possible geometry between the seat and guide is maintained when the guides are replaced\u003c\/li\u003e\n\u003cli\u003eThis means minimal material removal from the seat, time savings, and consistent chamber volumes, when valve jobs are performed with KPMI guides installed\u003c\/li\u003e\n\u003cli\u003eMaterial is mill certified, guaranteeing a consistent premium grade of material in every production run\u003c\/li\u003e\n\u003cli\u003eThis unique blend of materials create a guide that is extremely resistant to galling, which allows for tighter clearances than other materials\u003c\/li\u003e\n\u003cli\u003eThis reduction in clearance creates a better valve-to-seat seal and superior oil control\u003c\/li\u003e\n\u003cli\u003eC630 Racing Bronze material contains 80% copper alloyed with 5% nickel and 10% aluminum\u003c\/li\u003e\n\u003cli\u003eHigh copper content (20% greater than traditional manganese bronze materials) gives excellent thermal qualities\u003c\/li\u003e\n\u003cli\u003eEngine Builder C67410 Manganese Bronze Valve Guides were designed with the price conscious builder in mind and meets all the KPMI dimensional tolerance and design standards\u003c\/li\u003e\n\u003cli\u003eThe bronze alloy offers good high speed anti-galling\/seizure qualities with a 60% copper content for increased thermal conductivity over iron guides\u003c\/li\u003e\n\u003cli\u003eManganese guides are not quite as hard as the C630 bronze but can be reames to size with a carbide reamer\u003c\/li\u003e\n\u003cli\u003eHigh nickel content makes the guide harder and more wear- and corrosion-resistant than other bronze materials\u003c\/li\u003e\n\u003cli\u003eCorrosion resistance is an especially critical element of guide life with the new pump and performance fuels sold today\u003c\/li\u003e\n\u003cli\u003eAluminum content brings characteristics that make the guides especially compatible with aluminum cylinder heads\u003c\/li\u003e\n\u003cli\u003eA radius at the transition from the nose profile to the main body of the guide prevents galling on installation\u003c\/li\u003e\n\u003cli\u003eKit includes two valve guides unless noted\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"KPMI","offers":[{"title":"Default Title","offer_id":47232719683771,"sku":"CCP-191-59004","price":27.68,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0637\/5230\/6875\/files\/53837_1_1.jpg?v=1764612591","url":"https:\/\/motomentum.com\/products\/kpmi-intake-exhaust-valve-guide-bronze-mpn-91-91220","provider":"Motomentum","version":"1.0","type":"link"}