{"product_id":"wedgelocking-header-bolts-ls-1-181inl-x-8mm-12-pieces","title":"Locking Header Bolts","description":"\u003cp\u003e\u003cb\u003ePart #:\u003c\/b\u003e 66755\u003c\/p\u003e\u003cp\u003eEach PROFORM Grade 8 Header Bolt is permanently assembled with a pair of special washers. When the bolt is torqued to 28+ ft-lbs, the washers super-hardened external teeth bite into and grip the bottom of the bolt head and the top surface of the header. After being self-locked in this manner, any bolt-loosening rotation is blocked by a wedge-locking action created by the washers interfacing, matching cams. Its an uphill climb: vibration that might ordinarily loosen the bolt actually increases the wedge-locking tension, securing the bolt even more. Because this simple wedge-locking method uses tension instead of friction, contact with oil actually facilitates the wedge effect. When changing headers, PROFORM Header Bolts can be untightened with a normal wrench, lubricated, and reused.\u003c\/p\u003e\u003cp\u003eEngine Header Bolts\u003c\/p\u003e","brand":"Proform","offers":[{"title":"Default Title","offer_id":52081244209464,"sku":"P022 66755","price":34.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/horsepower-asset-605198-41007-square.webp?v=1782067419","url":"https:\/\/store.motormia.co\/products\/wedgelocking-header-bolts-ls-1-181inl-x-8mm-12-pieces","provider":"MOTORMIA","version":"1.0","type":"link"}