{"product_id":"fits-gm-ls-engines-with-3-8-wide-flange-1","title":"Proform 66826 Fits GM LS Engines with 3\/8\" Wide Flange","description":"Each 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.","brand":"Proform","offers":[{"title":"Default Title","offer_id":51181183369531,"sku":"BCHW_66826","price":64.31,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0955\/5958\/2011\/files\/9e71afbb9c602_4dc34a71-bca2-4e5c-a762-b8de00eaf5ab.jpg?v=1776502754","url":"https:\/\/performancepartscanada.ca\/products\/fits-gm-ls-engines-with-3-8-wide-flange-1","provider":"Performance Parts Canada","version":"1.0","type":"link"}