{"product_id":"fits-gm-bb-396-502-exc-348-and-409-ford-5-0l-sb-289-302-351w-mopar-417","title":"Fits GM BB 396-502 exc 348 and 409, Ford 5.0L, SB 289-302-351W, Mopar 414","description":"PROFORM Wedge-Locking Header Bolts ELIMINATE the need to constantly re-tighten collector bolts, and without the need for clips, pins, racing-wire, chemicals or gunk. The secret is in the Wedge-Locking Washer's super-hardened external teeth that \"bite\" into the bottom of the bolt head and the top flange surface. Vibrations that normally cause other bolts to loosen, are blocked by the wedge-locking action that uses tension, instead of friction to stay snug. In fact, contact with oil actually facilitates the effect. Installs\/uninstalls with a normal wrench, lubricate, and then reuse. Each set comes with sixteen Hex Head, Grade 8 (12.9) steel bolts (3\/8\"-16 thread, 1\" long) with a black oxide finish, and pre-assembled Wedge-Locking Washers.","brand":"Proform","offers":[{"title":"Default Title","offer_id":52963955704102,"sku":"BCHW_66824","price":34.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0672\/5697\/5654\/files\/4e938822fa997_cfde5cf9-2659-4a81-ab3c-72d9000bfcdf.jpg?v=1775243248","url":"https:\/\/ossparts.com\/products\/fits-gm-bb-396-502-exc-348-and-409-ford-5-0l-sb-289-302-351w-mopar-417","provider":"Operational Speed Supply","version":"1.0","type":"link"}