{"product_id":"proform-66826-wedge-locking-header-bolts-8mm-x-1181l","title":"Proform 66826 - Wedge Locking Header Bolts 8mm x 1.181L","description":"\u003cp\u003eProform 66826 - Wedge Locking Header Bolts 8mm x 1.181L\u003c\/p\u003e\u003cp\u003eHeader Bolt - Locking - 8 mm x 1.50 Thread - 1.181 in Long - Hex Head - Steel - Nickel Plated - Set of 16\u003c\/p\u003e\u003cp\u003eFits GM LS Engines with 3\/8\" Wide Flange\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\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eFeature\/Benefit\u003c\/strong\u003e: \u003cspan\u003eWedge-Locking Technology Eliminates Constantly Re-Tightening Exhaust Collector Bolts; Blocks Bolt-Loosening Rotation caused by Vehicle Vibrations.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eApplications\u003c\/strong\u003e: \u003cspan\u003eFits GM LS Engines with 3\/8-inch Wide Flange\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eCategory\u003c\/strong\u003e: \u003cspan\u003eHeader Bolts\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003ePart Type\u003c\/strong\u003e: \u003cspan\u003eHeader Bolts\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Proform","offers":[{"title":"Default Title","offer_id":47346930122890,"sku":"BCHW-66826","price":52.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0706\/0619\/2778\/files\/0_66826_normalized_10ab3f15-0423-4469-a595-7c1e1d260c7e.jpg?v=1777522571","url":"https:\/\/www.onlyinstock.com\/products\/proform-66826-wedge-locking-header-bolts-8mm-x-1181l","provider":"Only In Stock","version":"1.0","type":"link"}