{"product_id":"proform-66751","title":"Proform 66751 - Wedge-Locking Header Bolts Hex Head 3\/8 Diameter X 3\/4 Inch Black Oxide 12 Pcs","description":"\u003cp\u003eProform 66751 - Wedge-Locking Header Bolts Hex Head 3\/8 Diameter X 3\/4 Inch Black Oxide 12 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.\u003cbr\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 Thread X 3\/4 Inch Long\u003c\/li\u003e\n\u003cli\u003eBlack Oxide Finish\u003c\/li\u003e\n\u003cli\u003e12 Pcs in kit\u003c\/li\u003e\n\u003cli\u003eFits GM V6, SB 265-400, Buick, Olds, Pontiac 1979 and earlier, Mopar BB 383-440 exc 413, AMC V8 with 3\/8 inch bolts\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":47346838929546,"sku":"BCHW-66751","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0706\/0619\/2778\/files\/0_66751_normalized.jpg?v=1777522424","url":"https:\/\/www.onlyinstock.com\/products\/proform-66751","provider":"Only In Stock","version":"1.0","type":"link"}