{"product_id":"proform-pr66753-cam-lock-header-bolts-hex-head-3-8-16-thread-1-uhl-set-12","title":"Proform PR66753 Cam Lock Header Bolts Hex Head 3\/8\"-16 Thread 1\" Uhl Set 12","description":"\u003ctable\u003e  \u003ctbody\u003e   \u003ctr\u003e    \u003ctd\u003e    \u003cp\u003ePROFORM CAM LOCK HEADER BOLTS PR66753 HEX HEAD 3\/8\"-16 THREAD 1\" UHL SET OF 12\u003c\/p\u003e     \u003cp\u003eThese Proform wedge locking header bolts are permanently assembled with a pair of special washers. When the bolts are 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. Because this simple wedge-locking method uses tension instead of friction, contact with oil actually facilitates the wedge effect. When changing headers, the Proform wedge locking header bolts can be loosened with a normal wrench, lubricated, and reused. \u003c\/p\u003e    \u003c\/td\u003e   \u003c\/tr\u003e  \u003c\/tbody\u003e \u003c\/table\u003e \u003cbr\u003e\u003cbr\u003e\u003ctable\u003e  \u003ctbody\u003e   \u003ctr\u003e    \u003ctd\u003e    \u003cp\u003eApplication: Suit Chev small block V8\u003c\/p\u003e     \u003cdiv\u003eFastener Style: Bolt\u003c\/div\u003e     \u003cdiv\u003eThread Size: 3\/8-16 in.\u003c\/div\u003e     \u003cdiv\u003eHead Style: Hex\u003c\/div\u003e     \u003cdiv\u003eUnderhead Length (in): 1.000 in.\u003c\/div\u003e     \u003cdiv\u003eFastener Material: Steel\u003c\/div\u003e     \u003cdiv\u003eFastener Finish: Black oxide\u003c\/div\u003e    Quantity: Sold as a set of 12.\u003cbr\u003e     \u003c\/td\u003e   \u003c\/tr\u003e  \u003c\/tbody\u003e \u003c\/table\u003e","brand":"Proform Parts","offers":[{"title":"Default Title","offer_id":44636303130935,"sku":"PR66753","price":73.4,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/9364\/1015\/files\/130630_0b75ecbd-294c-4532-ae31-b3243c95d8d7.jpg?v=1780548590","url":"https:\/\/enginemaster.com.au\/products\/proform-pr66753-cam-lock-header-bolts-hex-head-3-8-16-thread-1-uhl-set-12","provider":"Engine Master","version":"1.0","type":"link"}