{"product_id":"proform-66756","title":"Proform 66756 - Wedge-Locking Header Bolts Hex Head 3\/8 Diameter X 1 Inch Blk Oxide Finish 16 Pcs","description":"\u003cp\u003eProform 66756 - Wedge-Locking Header Bolts Hex Head 3\/8 Diameter X 1 Inch Blk Oxide Finish 16 Pcs\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. Sold as a set.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Details:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eEngine Header Bolts\u003c\/li\u003e\n\u003cli\u003eWedge-Locking Technology\u003c\/li\u003e\n\u003cli\u003eHex Head Type\u003c\/li\u003e\n\u003cli\u003e3\/8-16 Inch x 1 Inch Long\u003c\/li\u003e\n\u003cli\u003eBlack Oxide Finish\u003c\/li\u003e\n\u003cli\u003e16 Pcs in kit\u003c\/li\u003e\n\u003cli\u003eFits Big Block Chevy|Ford 5.0L|Small Block Ford|Chrysler 413 Engines\u003c\/li\u003e\n\u003cli\u003eSold As A Set\u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"Proform","offers":[{"title":"Default Title","offer_id":47346839519370,"sku":"BCHW-66756","price":48.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0706\/0619\/2778\/files\/0_66756_normalized.jpg?v=1777522421","url":"https:\/\/www.onlyinstock.com\/products\/proform-66756","provider":"Only In Stock","version":"1.0","type":"link"}