{"product_id":"fits-gm-ls-engines-with-3-8-wide-flange-1","title":"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":52963955474726,"sku":"BCHW_66826","price":39.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0672\/5697\/5654\/files\/9e71afbb9c602_fe40c520-46c5-4ca1-b1fb-a76575d6db82.jpg?v=1775243241","url":"https:\/\/ossparts.com\/products\/fits-gm-ls-engines-with-3-8-wide-flange-1","provider":"Operational Speed Supply","version":"1.0","type":"link"}